(英语)高一英语情态动词解题技巧及练习题(含答案)

（英语）高一英语情态动词解题技巧及练习题(含答案)

一、单项选择情态动词

1．—It’s so hot and uncomfortable here! Why are your windows still closed?

—Oh, I’m not to blame. They ________ open.

A．shan’t B．mustn’t C．won’t D．wouldn’t

【答案】C

【解析】

【详解】

考查情态动词辨析。句意：---这里又热又不舒服！你的窗户怎么还关着？ ---哦，不该责备我啊。窗户打不开了。shan’t= shall not意为“不可, 不应”；mustn’t=must not意为“不要”；wouldn't=would not 意为“不会，不愿意”。won’t=will not意为“不会, 不能”， will在这里表示能力、功能。例如：This auditorium will seat one thousand people. 这个礼堂能容纳一千人。这句话意思是“这扇窗不能打开”，故选C项。

2．—What’s wrong with you?

—Oh, I am sick. I ________ so much ice cream just now.

A．shouldn’t eat B．mustn’t eat

C．couldn’t have eaten D．shouldn’t have eaten

【答案】D

【解析】

【详解】

考查情态动词和虚拟语气。句意：——你怎么了？——我生病了，我刚才不应该吃那么多冰激凌。A. shouldn’t eat不应该吃；B. mustn’t eat禁止吃；C. couldn’t have eaten不可能吃；D. shouldn’t hav e eaten本来不应该吃。根据just now可知，是发生在过去，故选D。

3．No student ________ go out of school to have lunch without permission of the headteacher. A．might B．must

C．shall D．could

【答案】C

【解析】

【详解】

考查情态动词。句意：未经校长允许，任何学生不得离开学校去吃午饭。might可能；must一定，必须；shall会，将；could能够。本句是一条禁令。shall用于肯定句并且主语是第一、三人称时，表示允诺，警告，劝告等语气。故选C。

4．Mark ______ have hurried. After driving at top speed, he arrived half an hour early. A．needn’t B．wouldn’t C．mustn’t D．couldn’t

【答案】A

【解析】

考查情态动词。need’t have done 本不必要做某事，句意：迈克本不必要着急的。他以全速驾驶后，他早到了半个小时。wouldn’t不会，m ustn’t禁止，couldn’t不可能，所以选A。

5．---Can I pay the bill by credit card?

---Sorry, sir. But it is the management rules of our hotel that payment ______________ be made in cash.

A．shall B．need

C．will D．must

【答案】A

【解析】

【详解】

考查情态动词词义辨析。A. shall用于法律法规或条文中，表示义务、规定等；B. need需要；C. will会；D. must必须。句意：——我能用信用卡支付么？——对不起，先生，现金支付是我们酒店的管理规定。故A项正确。

6．One of our rules is that every student _______ wear school uniform while at school. A．might B．could

C．shall D．will

【答案】C

【解析】

【详解】

考查情态动词辨析。句意：我们其中一条规则要求每个学生在校期间都要穿校服。shall可以表示“命令，警告，强制要求；允诺；法律，规定要做……”，结合句意可知C正确。

7．The room is so clean. He ________ have cleaned it yesterday evening.

A．will B．need

C．can D．must

【答案】D

【解析】

【详解】

考查情态动词表推测。句意：房间如此干净，他一定是昨天晚上打扫过了。must have done 表示对过去发生的事情有把握的猜测，意思是“一定（做过）”，故D项正确。

8．My sister met him in the street yesterday afternoon, so he ______ your lecture. A．shouldn’t have attended B．couldn’t have attended

C．mustn’t have attended D．needn’t have attended

【答案】B

【解析】

试题分析：考查情态动词用法。Shouldn’t have done本不应该做某事，实际上却做了（虚

拟语气）；couldn’t have done不可能做某事（对过去情况的推测）；needn’t have done本不需要做某事，实际上却做了（虚拟语气）；句意：我的姐姐昨天下午在街上遇见了他，所以他不可能去听了你的演讲。故B正确。

考点：考查情态动词用法

点评：考本题是高考必考考点，一定要牢记句型意思。must have done过去肯定做了某事。should have done 本应该做而实际未做。can’t have done 过去不可能做了某事；shouldn’t have done 本不应该做而实际做了。 need have done 本有必要做某事；needn’t have done 本没有必要做某事；注意没有mustn’t have done的形式。

9．—It’s already 11 o’clock , and he ______ have been here half an hour ago.

—Maybe he got caught in the rain.

A．must B．ought to

C．may D．can

【答案】B

【解析】

【详解】

考查情态动词。句意：已经11点了，他半小时前就该到了。A. must have done必定做了…（表示对过去的推测）；B. ought to have done 本应该做的；C. may have done可能已经做过某事；D. can have done本来可以做的（但没有做），根据题意，故选B。

10．He is a bad-tempered fellow, but he ________ be quite charming when he wishes. A．shall B．should

C．can D．must

【答案】C

【解析】

【详解】

考查情态动词辨析。句意：他是个脾气不好的家伙，但当他希望自己有魅力的时候，他可以变得相当可爱。此处表示“能、可以”，故C项正确。

11．—Did you attend the meeting for the experiment project yesterday?

—Yes, but I don’t think I ____ because my director was there.

A．need to have B．need to C．needed to D．need have

【答案】D

【解析】

【分析】

【详解】

考查情态动词+have done。句意：——你昨天参加实验项目的会议了吗?——是的，但我想我（本来）不需要，因为我的主管在那里。Think/suppose等宾语从句中如果有否定词时，要把从句的否定词not前移，即“否定前移”。所以not是从句中的否定词。“need have done”意为“本来有必要做而未做”；“needn’t have done”指过去本来没必要做而做了。根据上一句时间状语“yesterday”可知本句指的是过去发生的事。结合第二句“because my director was there(我的主管)在”可推断出，我本来不必要去。故选D。

12．I’m sorry, but you _____ go wrong. There’s no such man here.

A．need B．can C．must D．will

【答案】C

【解析】

【详解】

考查情态动词。句意：很抱歉，但是你一定是弄错了。这儿没有这么个人。A. need需要；

B. can能够；

C. must必须；

D. will将会。must指有把握的推测，“一定；必定”，结合下文There’s no such man here.可知一定是弄错了。故选C。

13．--- Difficulties always go with me!

--- Cheer up! If God closes door in front of you, there be a window opened for you.

A．must B．would

C．could D．can

【答案】A

【解析】

【详解】

考查情态动词辨析。句意：——困难总是伴随着我！——高兴点! 如果上帝在你面前关上了门，一定有一扇窗户为你打开。A. must必须；B. would将要；C. could能，会；D. can能，会。must表示对现在的状态推测时，意为“一定”，表示可能性很大的推测。符合语境。故选A。

【点睛】

1) must用在肯定句中表示较有把握的推测，意为"一定"。

2) must表对现在的状态或现在正发生的事情的推测时， must 后面通常接系动词be 的原形或行为动词的进行式。

3) must 表示对已发生的事情的推测时，must 要接完成式。

4) must表示对过去某时正发生的事情的推测，must 后面要接完成进行式。

5) 否定推测用can't。

本句中的。must表示对现在的状态推测时，意为一定，表示可能性很大的推测。符合第2点用法。

14．Lack of sleep _______ lead to weakened immunity and memory, and also slow physical growth.

A．shall B．must C．should D．can

【答案】D

【解析】

【详解】

考查情态动词辨析。句意：睡眠不足会导致免疫力和记忆力下降，还会减缓身体发育。A. shall将；B. must必须；C. should应该；D. can会，表示理论上或是逻辑判断上，用can，故选D。

15．If we had paid enough attention to the issue of the heavily-overloaded vehicles, the tragedy of the collapse of an overpass in Wuxi _____ avoided.

A．should B．could be C．should have been D．could have been 【答案】D

【解析】

【详解】

考查情态动词用法。句意：如果我们对超载车辆问题给予足够的重视，就可以避免无锡立交桥垮塌的悲剧。本句为“情态动词+have done”结构，结合句意表示“本来可以；本来能够”应用could have done结构，且主语与谓语动词avoid构成被动关系，故应用be done形式。故选D。

【点睛】

情态动词+have done的结构和用法有以下几种：

一、must have done sth.“一定做了某事”。表示对过去事情的较有把握的推测，这时只能用在肯定句中，“肯定/必须已经干过……”，在否定句和疑问句中用can’t或c ouldn’t或can/ could，例如：

1.From what you said, she must have told you all about it. 从你的话看，她一定告诉了你所有的事情。

二、can/could have done sth.本来能够做某事，而实际上未做；

1.But we could have done it all so much better. 但是，我们本可以把这一切做得更好。

三、can't/couldn't have done sth.不可能做过某事；

1. We could't have done it without you.

没有你我们办不成这事。

四、ought to/should have done sth.过去本应该做某事而实际上并没有做。

You should have done it when you first saw them blooming this spring. 你应该在今年春天第一次看到它们盛开的时候就挖一些的。

2.Even if it’s something you should have done earlier in the we ek or missed a detail on.

甚至你在一个星期前的就提早完成了一件事或者忽略了一个小细节。

16．What a pity! Considering his ability and experience, he ___________ it better.

A．need have done B．must have done

C．can have done D．might have done

【答案】D

【解析】

【详解】

考查虚拟语气中的情态动词。句意：真遗憾啊！考虑到他的能力和经验，他也许可以做得更好。can have done较少使用此结构，表示对过去行为的怀疑；用于疑问句时意为“难道

真的做了吗”，表示怀疑；need have done需要做某事，实际上却未做（表示虚拟语气）；must have done一定做了某事（表示对过去发生的事情的肯定推测）；might have done表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。故D正确。【点睛】

本题是高考必考考点，一定要牢记句型意思。must have done过去肯定做了某事。should have done本应该做而实际未做。can’t have done过去不可能做了某事；shouldn’t have done 本不应该做而实际做了。need have done本有必要做某事而没做；needn’t have done本没有必要做某事；注意没有mustn’t have done的形式。

17．You ________ be Carol. You haven’t changed a bit after all these years.

A．must B．can C．will D．shall

【答案】A

【解析】

【详解】

考查情态动词。句意：你肯定是卡罗，这些年你一点也没有变化。must表示对现在的肯定推测；can表示推测，表示可能性；will表示意愿；shall表示表示决心、命令或指示。根据下文“这些年你一点用没有改变”可知，前文表示肯定性推测。故选A。

【点睛】

must表推测的用法must表示很有把握的推测，其意为“一定会”“肯定会”，只用于肯定句，一般不用于否定句或疑问句。表示对现在或未来的情况作推测，后接动词原形。You have worked hard all day. You must be tired. 你辛苦一整天，一定累了（对现在情况的推测判断）I didn’t hear the phone. I must have be asleep. 我刚才没有听到电话，我想必是睡着了。

18．—I heard they went skiing in the mountains last winter.

—It true because there was little snow there.

A．may be not B．won’t be C．couldn’t be D．mustn’t be

【答案】C

【解析】

【详解】

考查情态动词辨析。句意：我听说他们去年冬天去山里滑雪。--不可能是真的，因为那里几乎没有雪。A. may be not可能不；B. won’t be 不会；C. couldn’t be不可能是；D. mustn’t be禁止。根据because there was little snow there.可知这里是否定推测，couldn’t be“不可能

是”符合句意，故选C项。

19．Peter searched all the places where he________have left her iPad but it was all in vain. A．might B．would C．must D．should

【答案】A

【解析】

【详解】

考查情态动词辨析。句意：彼得找遍了所有他可能放她的iPad的地方，但都没有找到。A. might可能；B. would将会；C. must必须，一定；D. should应该。might have done表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中。故选A。

20．According to the latest rule, people _______sort household garbage into four categories. A．can B．shall C．may D．need

【答案】B

【解析】

【详解】

考查情态动词辨析。句意：根据最新的规定，人们应该把生活垃圾分成四类。A. can能；B. shall应该；C. may也许；D. need需要。shall用于第二人称表示承诺、命令、警告、威胁

的口吻，这里是指法令规定了……，因此用shall。故选B。

21．—I ha ve something important to tell John. But I can’t find him.

—His cell phone is here, so he ________ have gone too far.

A．mustn’t B．needn’t

C．wouldn’t D．can’t

【答案】D

【解析】

【详解】

考查情态动词。句意：——我有重要的事情要告诉John，但是我找不到他。——他的手机在这儿，所以他不可能走得太远。根据句意可知，此处是对过去的一种猜测，此处是表达不可能……，用can’t have done。故选D。

22．He _____ his stay in France, didn't he? He looks amazingly different.

A．will have enjoyed B．should have enjoyed

C．can have enjoyed D．must have enjoyed

【答案】D

【解析】

【详解】

考查情态动词+have done。句意：他在法国一定过得很愉快，是吗?他看起来很不一样。must have done一定做某事。表示对过去事情的较有把握的推测。由“ He looks amazingly

different.”可知，他在法国一定过得很愉快。所以这是对过去事情的较有把握的推测。故选D项。

23．Every coin has two sides. Beautiful songs, sometimes, ________ just be noise to others. A．must B．should C．may D．would

【答案】C

【解析】

【详解】

考查情态动词。句意：任何事物都有两面性。美丽的歌曲，有时候，对别人来说也许是噪音。A. must一定，表示肯定推测；B. should应该；C. may也许，可能；D. would将会，表示对将来的推测。分析句子可知，此处应该表示可能的推测，“美丽的歌曲，有时候，对别人来说也许是噪音。”。结合选项，故选C。

24．Mr. Baker, some students want to see you. ______ they wait here or outside?

A．May B．Should C．Shall D．Will

【答案】C

【解析】

【详解】

考查Shall的用法。句意：贝克先生，有些学生想见你。他们是在这里等还是在外面

等?Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。故选C。

【点睛】

Shall的用法

Shall作为助动词，一般用于第一人称Ⅰ和We，表示一个将来的动作，构成将来时态。Shall后面接动词原形。例如：

（1）I shall think it over and Let you know my idea.我将考虑一下此事，然后告诉你我的想法。

（2）We shall have a good time in the park.我们在公园里会玩得很高兴的。常考的特殊用法

1. Shall用于第一人称，表示征求对方的意愿。如：What shall we do this evening?

2. Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。如：Shall we begin our lesson?When shall he be able to leave the hospital?

3. Shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。如：You shall fail if you don't work harder. （警告）

He shall have the book when I finish reading. （允诺）

He shall be punished. （威胁）

25．Most of the top leaders expressed a common desire at the UN conference, ______ that different cultures ______ coexist with tolerance.

A．the one ; must B．the one ; should C．one ; must D．one ; should

【答案】D

【解析】

【详解】

考查替代和情态动词。句意：大多数高层领导人在联合国大会上表达了一个共同的愿望，即不同的文化应该与宽容共存。大多数高层领导人在联合国大会上表达了一个共同的愿望，即不同的文化应该与宽容共存。替代表泛指的单数名词，通常用one替代。此处用one替代前面的a desire，是同位语；结合句意第二空用情态动词should“应该”。故选D。【点睛】

that ,it ,one 代指前面的名词时的用法

1.one 指代前面出现的可数名词，是泛指。可以和冠词连用，也可以有自己的定语。一般不能用做特指，但和定冠词连用时可以是特指。如： Please show me the cup, the red one on the shelf.

2.It 指代前面提到的单数名词，相当于the one。当one是泛指的时候，指的是同名异物，it是指同一物体.如： ----Do you want the cup ? ---Yes ,I want it.

3.that通常用来代替前面出现的可数名词\不可数名词,主要是用来避免重复。如： The weather of Guangzhou is hotter than that of Beijing.

26．Using AI， many companies are now conducting experiments that__________ possible just a few years ago．

A．would have been B．might have been

C．shouldn't have been D．couldn't have been

【答案】D

【解析】

【详解】

考查情态动词表推测。句意：很多公司现在使用人工智能进行试验，这在几年前是不可能的。根据“a few years ago”可知，此处表示“过去不可能”，应该用couldn’t have done，故D 项正确。

27．Tom, you _____ leave all your clothes on the floor like this!

A．wouldn’t B．mustn’t C．needn’t D．may not

【答案】B

【解析】

【详解】

考查情态动词辨析。句意：汤姆，你不要把所有的衣服都这样扔在地板上! A. wouldn’t 不会； B. mustn’t 禁止；C. needn’t不需要；D. may not不可以。本句为祈使句，所以mustn’t “禁止”符合句意。故选B项。

28．—It's so cold here! Why haven't you turned on your air-conditioner?

—Well, it ______ turn on.

A．shouldn't B．can't C．won't D．shan't

【答案】C

【解析】

【详解】

考查情态动词。句意：——这里太冷了！你为什么不把空调打开呢？——嗯，这个空调老是打不开。A. shouldn't不应该；B. can't不能；C. won't偏偏不，老是不，此处是表示习惯或倾向；D. shan't不会。这里使用will的否定won't表示事物的自然属性“空调总是开不开”。故选C项。

29．We’ll make the final d ecision on our scheme. ______ you change your mind, please inform us as soon as possible.

A．Should B．Were C．Would D．Had

【答案】A

【解析】

【分析】

【详解】

考查虚拟语气。句意：我们将对我们的计划做最后决定。如果你改变主意，请尽快通知我们。根据语境，此处用虚拟语气，表示与将来相反，从句用should+动词原形，省略if，should提前，陈述句是：If you should chang e your mind……。故选A。

【点睛】

虚拟语气中的倒装

当虚拟条件句中含有 were，had，should时，可以将if省略，然后将 were，had，should，移至句首：

1）If he should fail, he would kill himself.

→Should he fail, he would kill himself.

万一失败，他就会自杀。

2）If I were you, I would do it at once.

→Were I you, I would do it at once.

假若我是你，我就会马上做。

要是我能做此事，我一定会做。

3）If he had seen you yesterday, he would have asked you about it.

→Had he seen you yesterday, he would have asked you about it.

他昨天要是看到了你，他就会问你这事了。

该小题属于上述的第一种情况。should作为情态动词，有一种特殊的用法：在虚拟条件状语从句中表示与将来事实相反的虚拟语气，可以把should放在句首，即主语前，从而省略从属连词if。原来的表述为：If you should change your mind。故选A。

30．Mr. Smith is almost on time for everything. How ________ it be that he was late for the meeting?

A．can B．should C．may D．must

【答案】A

【解析】

【详解】

考查情态动词辨析。句意：史密斯先生几乎任何事情都是准时的。他怎么可能开会迟到了？ A. can可能，可能性，表示可能性时，常用于否定句和疑问句中，且有时还带有“惊奇、不相信” 等感情色彩。B. should 应该； C. may也许，表示可能性时常用于肯定句中，不用于疑问句中。D.must常用于肯定句中表推测，“一定……”的意思；本题是强调句型的一个变式：强调其特殊疑问句how的形式。根据前句“斯密斯先生几乎是很准时”可推测出“怎么可能开会迟到呢？”。根据句意可知，用于疑问句中的“可能性”且有不相信的色彩，四个选项只有“can”符合题意。故选A

【点睛】

情态动词就是表示说话者对事情的一种看法，也就是一种语气。情态动词的用法一直是命题者常设置的考点和重点，平时要加强记忆。

31． ---Is Jack on duty today?

---It ________ be him. It's his turn tomorrow.

A．mustn't B．won't C．can't D．needn't

【答案】C

【解析】

【详解】

考查情态动词表示推测。句意：--今天杰克值日吗？--不可能是他。明天该轮到他。can’t be 用于否定推测“不可能是”，must表示推测的时候，表示“肯定是”，won’t不愿意，needn’t 不必，故选C。

32．-- Did Jim come?

-- I don’t know. He _______ while I was out.

A．might have come B．might come

C．must have come D．should have come

【答案】A

【解析】

【详解】

考查情态动词推测用法。句意：Jim来了吗？--我不知道，在我不在的时候，可能来过。根据前文I don’t know.可知，说话者不知道Jim来没来，因此后文推测来过，但是语气很不确定，故可知选A。对过去情况的推测为情态动词+have done，must have done 一定做了某事，should have done 应该来过，不符合，故选A。

【点睛】

情态动词+have+过去分词的用法，表示推测或判断过去的情况。

can/could+have+过去分词用法：①多用于否定句和疑问句中。表示对过去某事发生的可能

性的否定或质疑，意为：不可能（已经）......了-（否定句）/可能（已经）......了嘛？-（疑问句）②用于肯定句中。表示对过去没有做某事的遗憾，含有轻微的责备，意为：本来可以......的（但实际上没有......）。You could have done better, but you were too careless.（肯定句。他能做得更好的）

should/ought to+have+过去分词用法：用于肯定句中。表示对过去没有做某事的遗憾，含有责备的意思，意为：本来应该......的（但实际上没有......）。用于否定句中-表示对过去已经做了某事的责备，意为：本来不应该......的（但实际上已经......了）。He should have been asleep.（肯定句，他本应去睡觉的）He shouldn't have been asleep.（否定句，他本来不应该去睡觉的）。

may/might+have+过去分词用法：用于肯定句和否定句中，表示对过去发生某事的可能性的推测，意为：或许（已经）....../或许还没有......。It is too late. He may have gone to bed. must+have+过去分词用法：表示对过去发生的事情十分肯定的推测。must表示推测时，不能用在否定句和疑问句中。I must have forgotten to tell you.（must 的引入，表达了说话者对过去忘记告诉你的这件事肯定推测）

needn't+have+过去分词

用法：表示对过去已经做了某事的后悔，意为：本来可以不必......的（可实际上却已经......）You needn't have taken a taxi here, for it was very near to my home.

33．Days later, my brother called to say he was all right, but _______say where he was. A．mustn’t B．shouldn’t C．wouldn’t D．mightn’t

【答案】C

【解析】

考查情态动词。句意：“数天后，我弟弟打电话说他很好，但不肯告诉我他在哪

里。”mustn’t“禁止”；shouldn’t“不应该”；wouldn’t“不情愿”；mightn’t“不可能”。

34．— Excuse me, could you please tell me how to get to the nearest Wenfeng Supermarket?—OK, It’s two blocks straight ahead. You ________ miss it.

A．can’t B．mustn’t

C．needn’t D．wouldn’t

【答案】A

【解析】

【详解】

考查情态动词。句意：——劳驾，你能告诉我最近的Wenfeng Supermarket怎么走吗?——好的，一直往前走两个街区就到了。你不会错过的。A. can’t不可能；B. mustn’t禁止，不允许；C. needn’t不必；D. wouldn’t不会。故选A。

35．—I saw your uncle take a taxi to the airport. Why didn’t you drive him there?

—I __________. But my car ___________ .

A．would; was fixed B．would have; was fixed

C．would have; was being fixed D．did; was being fixed

【答案】C

【解析】

【详解】

考查虚拟语气和动词时态。句意：---我看见你叔叔坐出租车去机场了。你为什么不开车送他去那里呢？---我本来想送他了。但是我的汽车当时正在修理。根据语境可知说话人表示本来想做但是没有做的事情，应该用would have done；而修理汽车是指当他叔叔去机场的时候，表示过去正在进行的动作，故答案选C。

36．—______ you sing and dance at this late hour of the night?

—Sorry, I will stop right now.

A．May B．Shall

C．Will D．Must

【答案】D

【解析】

试题分析：考查情态动词的用法。 May可以，可能 Shall： 用于第一三人称的疑问句，表示说话人征求对方的意见或向对方请示。?用于二三人称的陈述句表示说话人给对方的命令、警告、允诺、威胁或决心等。?用于法律、法规条文、合同等，按规定应该履行的义务等。Will 表示请求或建议；表示意愿或表示现在的习惯D. Must表示“必须”“一定”“偏要”之意。此处must表示“偏要,偏偏”。句意：——你偏要在深夜又唱又跳吗？——很抱歉，我会马上停止。

考点：考查情态动词的用法。

37．—Isn’t that Ann’s husband over there?

— No, it ________ be him —I’m sure he doesn’t wear glasses.

A．must not B．can’t C．won’t D．may not

【答案】B

【解析】

【详解】

考查情态动词：句意：那不是安的丈夫吗？---不，肯定不是他，我确定他不戴眼镜。A. must not禁止;B. can’t 不能;C. won’t不会;D. may not可能不。表示否定的推测，不可能，用can’t。故选B项。

38．—Life ____ be very hard for people living in the north of Canada as it is very cold there in winter.

—Yes, the weather there _____ be as low as 60℃ below zero.

A．must; can B．shall; must C．will; should D．has to; can

【答案】A

【解析】

【详解】

考查情态动词。根据句意：——对于生活在加拿大北方的人来说生活肯定很艰难，因为冬天那儿很冷。——是的，那儿的天气可能会达到零下60度。must表肯定推测，意为“肯定，一定”，can表客观上的可能性，意为“可能”。根据语境及选项可知，A选项正确。故选A。

39．Sometimes it seems that doors ___________ be closed for you, but remember, they are not all locked.

A．must B．should C．may D．need

【答案】C

【解析】

【详解】

考查情态动词的用法。句意：有时候，似乎大门正对你关闭，但请记住并非所有大门都被上了锁。A. must一定，必须；B. should应该；C. may可能，也许；D. need需要。本句不宜使用绝对化的语气，从sometimes，seems等提示词可看出应使用较为温和的推测语气，因此may be（或许，也许）符合语境，而过于绝对的推测，如must be（一定是，肯定是）应予排除。此外should和need在此并不表示推测，更不符合本句语境。故选C。

40．—How long shall we wait here?

—The first bus set out earlier than usual today and _____ be here any time, I think.

A．should B．might C．can D．must

【答案】A

【解析】

【详解】

考查情态动词表推测。句意：—我们要在这里等多久？—首班车比往常发车的时间早了，我推测可能会在任意时间到达。should 用于表示‘事实上的可能性’或者‘推测’，多用于肯定句。故选A。

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