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【英语】情态动词-知识点归纳与练习

一、初中英语情态动词

1．—Must I clean the classroom now? —No, you_______.

A. mustn't

B. can't

C. needn't

【答案】 C

【解析】【分析】句意：--我必须现在把教室打扫干净吗？--不，你不必。must I do …?的否定回答是No, you needn't 或者 No , you don't have to 。根据是否定回答，故选C。

2．All passengers ______ go through safety check before they take a plane.

A. can

B. may

C. must

D. could

【答案】 C

【解析】【分析】句意：所有乘客登机前必须接受安全检查。A. can能够，表示能力；B. may可以，表示许可；C. must必须；D. could可能，可以。登机前必须安检。故选C。【点评】情态动词词义辨析。以及can、may、must、could四个词的词义和用法。

3．Please don't make so much noise. I ________ hear the speaker very well.

A. needn't

B. can't

C. shouldn't

D. mustn't

【答案】 B

【解析】【分析】句意：请不要发出那么多噪音。我不能很好地听清楚发言者的话。needn't不必；can't不能；shouldn't不应该；mustn't禁止。根据前半句的Please don't make so much noise.可知别人发出了太多噪音，所以他无法听见演讲者的话，故用情态动词can't。故选B。

【点评】考查情态动词，结合句意和词义做出判断。

4．A hard-working man ______ become a great scientist, but a great scientist _______ be a hard-working man.

A. can't; can

B. may not; must

C. can't; must

D. may not; can

【答案】 B

【解析】【分析】句意：一个勤奋的人可能不会成为一位伟大的科学家，但是一位伟大的科学家一定是一个勤奋的人。can't不可能，不会；can可能，能，会；may not 可能不；must 必须，一定；结合句意，可知，第一个空为“可能不”，第二个空为“一定”，故答案为B。

【点评】考查情态动词。掌握情态动词表推测时的意义和用法。

5．Look at the sign! It says “No Smoking!” You ________ smoke here. It's dangerous.

A. mustn't

B. ought not to

C. needn't

D. don't have to

【答案】 A

【解析】【分析】句意：看这个标志！上面写道“禁止吸烟！“你不能抽烟。这是危险的。

A.mustn't 禁止，不允许；

B.ought not to不应该，不应当；

C.needn't不必；

D.don't have to 不必。根据“No Smoking!”可知此处禁止吸烟，故答案为A。

【点评】考查情态动词。掌握情态动词的意义和用法。

6．—Shall we meet at the station at 9 a.m.?

—In fact we ______. The train ______until 11a.m.

A. needn't; will leave

B. needn't; won't leave

C. mustn't; leaves

D. mustn't; doesn't leave

【答案】 B

【解析】【分析】句意：—我们上午9点在车站见面好吗？—事实上我们不需要。火车直到11点才离开。needn't情态动词，不需要，没必要；mustn't情态动词，不允许，语气强烈，本题含义只是“不需要”,并没有“禁止、不许”这样强烈的语义。not...until...，意为“直到...才...”，表示将来发生的事情，所以使用一般将来时态的否定形式won't。故选：B。

【点评】考查情态动词辨析，固定搭配not...until...。一般将来时态。

7．—Who it be that is knocking at the door?

—It be father, but I'm not sure.

A. call; must

B. can; may

C. must; can

D. may; must

【答案】 B

【解析】【分析】句意：——敲门的人可能是谁呢？——他可能是父亲，但是我不确定。第一空，can可能，表猜测用语疑问句形式，may是表可能；第二空，根据后面的but I'm not sure，可知表示不确定的猜测，应填may，故选B。

【点评】此题考查情态动词辨析。先弄清每个情态动词的使用规则。根据上下文的联系确定情态动词的使用。

8．—I wonder if this smart phone is Mary's.—It _______ belong to her. _______ is totally different from this one.

A. mustn't; Her

B. can't; Her

C. can't; Hers

D. may; Hers 【答案】C

【解析】【分析】句意：――我想知道这个智能机是否是玛丽的。――不可能属于她，她的和这个完全不同。情态动词表示推测时，用must表示“一定”，用might, could表示“可能”，用can't表示“不可能”。从句意看，这手机与她的完全不同，故不可能是她的，前面用can't。形容词性的物主代词后一定有一个被修饰的名词，名词性的物主代词后没有被其修饰的词，本题后没有被修饰的词，用名词性的物主代词，“她的”：hers。故选C。

9．I can't go with you. I _______ stay at home until my parents come back.

A. can

B. may

C. must

D. could

【答案】 C

【解析】【分析】句意：我不能和你一起去。我必须呆在家直到我父母回来。A. can能，

表示能力；B. may可以，表示许可；C. must必须，强调主观愿望；D. could可以，表示允

许、请求。父母没回来前，我必须待在家。故选C。

【点评】此题考查情态动词的用法。

10．We don't allow taking magazines out, but you ____________ copy the article you need on

the machine over there.

A. can

B. must

C. should

D. would

【答案】 A

【解析】【分析】句意：我们不允许把杂志带出去，但是你可以在那里抄下你需要的文

章。can能，能够，可以；must必须；should应该；would将；此处表示可以，允许，故

选A。

【点评】此题考查情态动词辨析。弄清每个情态动词的使用规则，根据上下文的联系确定

所使用的情态动词。

11．Harry's been driving all day—— he be tired.

A. need

B. can

C. shall

D. must

【答案】 D

【解析】【分析】句意：哈利已经开了一整天车了——他一定累了。根据句意可知，开了

一整天车，所以推测他累是一定的。所以用情态动词must。故选D。

12．According to the law, traffic keep to the left in England.

A. may

B. must

C. need

D. can

【答案】 B

【解析】【分析】句意：根据法律规定，在英国车辆必须靠左形式。A.may可以，表示允

许；B.must必须，表示要求；C.need需要，表示必要性；D.can能，表示能力。根据According to the law,可知法律的要求，应是必须的，应用must，故答案为B。

【点评】考查情态动词。掌握情态动词的常用法。

13．Rock music ______ sound popular with the young, but it's not the favor of the aged people.

A. must

B. need

C. should

D. may

【答案】 D

【解析】【分析】句意：摇滚音乐在年轻人中听起来受欢迎，但是它不受上了年龄的人的

赞同。must, 表示猜测时，指把握比较大的肯定猜测，肯定……；need需要；should,应该；

may，表示把握比较小的肯定猜测，可能，也许。结合句意，故选D。

【点评】考查情态动词辨析，注意几个常见情态动词的意思和用法。

14．— Sorry, I forgot to take money with me. Maybe I can't buy the book you like.

— Mum, you ______ worry about it. We can pay by Alipay （支付宝）.

A. can't

B. needn't

C. mustn't

D. shouldn't

【答案】 B

【解析】【分析】句意：——对不起，我忘记带钱了。也许我不能买你喜欢的书。——妈妈，你不用担心。我们可以用支付宝支付。A. can't不能，指不允许或否定推测；B. needn't 不需，指没必要；C. mustn't不能，表禁止；D. shouldn't不应该，表建议。根据句意语境，本句是说妈妈不需要担心，故答案为B。

【点评】考查情态动词。理解句意并掌握情态动词的意义和用法区别。

15．— Dick, ________ I use your e-dictionary? — Yes, sure. ________ you give it to David after you use it?

A. will; Would

B. may; Might

C. can; Could

D. shall; Should

【答案】 C

【解析】【分析】句意:一Dick我可用一下你的电子词典吗?一当然可以。在你用完后你能把它给他David吗？根据句意及题干分析第一空表示请求允许，所以可以用may或can;第二空是表示对别人的请求.所以用could表示更加委婉，故选C。

16．—Mum, I play football this afternoon?

—Sure, but you finish your homework first.

A. may; could

B. can; must

C. can; mustn't

D. may; can't

【答案】 B

【解析】【分析】句意：－妈妈，今天下午我能踢足球吗？－当然，但是你必须先完成作业。前句提请求，can,may都可以；后句，由sure可知后句用肯定回答。Could表示一种委婉的语气；must表示主观愿望：必须。妈妈要求孩子“必须”先完成作业。故选B。

【点评】考查情态动词辨析，may表示请求时候的回答用语。

17．—Look! The woman at the school gate ______be her headmaster.

—No, it ______ be her. She is holding a meeting in the office now.

A. must; can't

B. must; mustn't

C. can; needn't

D. may; mustn't

【答案】 A

【解析】【分析】句意：——看！学校门口的那个妇女一定是她的校长。——不，不可能是她。第一空，must表示“一定”；空二，根据She is holding a meeting in the office now. 她现在正在办公室开会，可知，不可能是校长，用can't，表示不可能。故选A。

【点评】考查情态动词辨析。注意不同情态动词的用法，注意理解句意。

18．This book _________ be Lucy's. Look! Her name is on it.

A. can

B. may

C. must

D. might

【答案】C

【解析】【分析】句意：这本书一定是露西的。看，她的名字在上面。A. can 能；B. may 可能，可以；C. must 必须，一定；D. might可能；根据Her name is on it.可知一定是她的，故选C。

【点评】考查情态动词。根据语境选出合适的情态动词，熟记情态动词的用法。

19．You __________ write the poem down. Our teacher will give us a copy soon.

A. needn't

B. mustn't

C. shouldn't

D. can't

【答案】A

【解析】【分析】句意:你不需要把诗抄下来，老师很快会给我们一份。A.不必;B.不准，禁止，不允许;C.不应该，表示责任、义务;D.不能，表示能力，不可能，表示否定的推测。老师要给我们一份，所以不必抄写。故选A。

20．—I think we need to sit down and have a talk. —I agree more. Let's take the bench over there.

A. could

B. couldn't

C. should

D. shouldn't

【答案】B

【解析】【分析】试题分析:句意:一一我认为我们需要坐下来谈一谈。一一我完全同意。我们到那边凳子上坐。I could agree more我可以同意更多的，I couldn't agree 我不同意I couldn’t agree more.我完全同意I should agree more.应该同意更多，I shouldn't agree more我不应该同意更多.后句Let's take the bench over there.我们在那边的凳子上坐吧）可以推测出，我同意。故选B。

21．Size and type do not matter — you ______ do almost anything if you never give up. A. should B. must C. need D. can

【答案】 D

【解析】【分析】句意：大小和类型不重要——如果你不放弃，你几乎可以做任何事。A. should应该；B. must 必须； C. need 需要；D. can可以，能；根据 if you never give up，可知此处说你能做几乎任何事情，故选D。

【点评】此题考查情态动词辨析。根据上下文的联系确定所使用的情态动词。22．Children sit in the front seat of the car. It's too dangerous.

A. need

B. needn't

C. must

D. mustn't

【答案】 D

【解析】【分析】句意：孩子们不得坐小车的前排。太危险了。A.需要，必须;B.不必,不需要;C.必须;D.不准，不得，禁止。根据句意，因为太危险了，所以孩子们不准坐前排的位置。故选D。

23．—Must I come before 6: 30 tomorrow?

—No. You______. There will be plenty of time.

A. mustn't

B. can't

C. couldn't

D. needn't

【答案】 D

【解析】【分析】句意：—明天我必须六点半前到吗？—不，你不必，将有足够的时间。Must是“必须”的意思，当其变为一般疑问句时，否定回答要用needn't“不必”；肯定回答用must“必须”，mustn't不是“不必”的意思，而是一种禁止，一定不能做的意思。故选D。【点评】本题考查情态动词的用法。熟记must问句的回答。

24．—How amazing this robot is!

—Wow, it has video cameras in its eyes, so it “see” and in teract with people.

A. may

B. can

C. must

D. should

【答案】 B

【解析】【分析】句意：—这个机器人多么惊人啊！—哇，在它的眼睛里有摄像机，因此它能看见和人打交道。A. may 可以，可能；表示许可，B. can 能；表示能力，C. must 必须；D. should应该；根据it has video cameras in its eyes,可知是有能力看见，故选B。

【点评】考查情态动词辨析。熟记情态动词的含义和用法。

25．—He be in the classroom,I think.

—No, he be in the classroom. I saw him go home a minute ago.

A. can； may not

B. must； may not

C. may； mustn't

D. may； can't 【答案】 D

【解析】【分析】句意:——我认为他可能在教室里。——不，他肯定没有在教室里，我刚才看到他回家了。must,can（could）,may（might）可以表示猜测，must表示肯定猜测，用于肯定句，肯定……一定……；can't表示否定猜测，肯定不……，另外can（could）,may （might）,表示可能性猜测，可能……根据I think,可知把握较小，根据I saw him go home a minute ago.可知第二句把握大，故选D。

26．School students ______________ smoke because it is against the school rules.

A. needn't

B. couldn't

C. won't

D. mustn't

【答案】 D

【解析】【分析】句意：学校的学生一定不要吸烟因为这是违反学校的规定的。needn't不必；couldn't不能；won't将不会；mustn't禁止，一定不要，根据because it is against the

school rules.可知是禁止，一定不能，故选D。

【点评】此题考查情态动词辨析。根据上下文的联系和句子的语气确定所需要的情态动词。

27．—Is that boy Scott？

—No, it be Scott. Scott is much taller.

A. can

B. can't

C. mustn't

【答案】 B

【解析】【分析】句意：——那个男孩是Scott吗？——不，他不可能是Scott。Scott个字高很多。A可能、可以；B不可能；C禁止。根据题干中Scott is much taller.可知斯科特更高，所以那个男孩不可能是斯科特，如表示对现在情况的否定推测，应用can't+动词原形，故答案选B。

【点评】考查情态动词，注意平时识记其用法，理解句意。

28．David, you please sweep the floor and take out the trash?

A. could

B. may

C. might

D. must

【答案】 A

【解析】【分析】句意：——大卫，你能打扫一下地板把垃圾拿出去吗？could能，能够；may可以；might有可能；must必须。Could/Would you please do sth?你做某事好吗，固定句式，表示语气的婉转，故选A。

【点评】此题考查情态动词。注意固定句式Could/Would you please do sth?

29．——Mum, the train is leaving in eight minutes. I go now.——Okay, Jim, call me when you get there.

A. may

B. must

C. can

【答案】B

【解析】【分析】句意:一妈妈，火车八分钟后出发，我现在必须走了。一好的，吉姆，到了给我电话。A.may可以，表示允许或请求许可;B. must必须，强调主观愿望;一定，表示肯定的推测。C. can能，表示主语所具备的能力。火车要出发了，我必须走了。表示必须:must，故选B。

30．The girl in the classroom_____ be Mary. She called me from Beijing just now.

A. mustn't

B. needn't

C. shouldn't

D. can't

【答案】D

【解析】【分析】句意:教室里的女孩不可能是玛丽。她刚才从北京给我打的电话。A.不准，不允许，禁止;B. 不必;C.不应该;D.不可能。后句句意可以堆测出玛丽不在教室，表示否定的推测，不可能，故选D。

31．— Is that Mr. Green?

— Impossible. He has gone to America. It be him.

A. could

B. must

C. can't

D. might

【答案】C

【解析】【分析】句意：——那是格林先生吗？——不可能，他去美国了。不可能是他。

A.could可能，表示对目前情况作的可能的推测；可以，表示委婉的语气；

B. must必须，强调主观的愿望；一定，表示对目前作的肯定推测；

C. can`t不能，表示能力；不可能，表示否定的推测；

D. might可能，表示可能的推测。根据句意，他去美国了，所以那不可能是格林先生。故选C。

32．You return the book now. You can keep it until next week if you like.

A. have to

B. can't

C. mustn't

D. needn't

【答案】 D

【解析】【分析】句意：你不必现在归还这本书，如果你喜欢，你可以到下周再还。have to必须；can't不能；mustn't不准，一定不要；needn't不必。根据You can keep it until next week if you like.（你可以到下周才还。），可知现在不必还，用needn't。故选D。

33．— Where did you put your schoolbag?

— I can't remember. I attended a concert yesterday so it still be in the music hall.

A. can't

B. need

C. might

D. must

【答案】 C

【解析】【分析】句意：一一你把你的书包放在哪儿了?一一我记不得了，我昨天出席了一个音乐会，因此它可能还在音乐厅里。A.can't 不能，表示能力;不可能，表示否定的推测;B.need 需要，必须;C. might可能，表示推测，可以，表示许可;D.must必须;一定，表示肯定的推测。我记不得了，因此在音乐厅只是一个可能情况，故选C。

34．—Is that red schoolbag Mary's？

— It ____be hers. She hates that color.

A. may

B. must

C. can't

D. might

【答案】 C

【解析】【分析】句意：——那个红色的书包是Mary的吗？——不可能是她的。她讨厌那个颜色。A.可能；B.一定；C.不可能；D.可能。根据She hates that color她讨厌那种颜色，可知不可能是她的书包，用can't be表示否定的猜测，故答案选C。

【点评】考查情态动词，首先记住情态动词的词义，然后理解句意，选择正确答案。

35．—Could you please play tennis with me now?

—Sorry, I ________. I have to finish my homework first.

A. can't

B. couldn't

C. shouldn't

D. wouldn't

【答案】 A

【解析】【分析】句意：——请问，现在你能和我一起打网球吗？——对不起，我不能。我必须先完成作业。can't不可以，couldn't可能不，shouldn't不应该，wouldn't不愿意。根据Could you please……?表示请求，不同意，应说不可以，故答案选A。

【点评】考查情态动词，注意识记情态动词的用法和理解句意。

36．— What's the matter with Tom? He's been absent for two days.

— Oh! He be ill. Let's go and see him.

A. need

B. might

C. must

D. should

【答案】 C

【解析】【分析】句意：——汤姆怎么了？他已经缺席两天了。——哦！他可能病了。我们去看看他吧。need需要，指有必要；might可能，表示推测语气，可能性很小；must一定，表肯定推测；should应该，表建议。根据Let's go and see him.，可知推测汤姆生病了，去看看汤姆，表示肯定的推测，用must，故选C。

【点评】考查情态动词辨析。根据上下文的联系确定所使用的情态动词。

37．— __________I wear a tie to Janet's birthday party?

— No,you needn't. But do remember to bring her a present.

A. Must

B. Should

C. Need

D. Can

【答案】 A

【解析】【分析】句意：——我必须戴领带去参加Jane的生日聚会吗？——不，你不必，但是记住给她带个礼物。对于must的否定回答是用needn't。而should应该；need需要；can可以。所以根据回答可知选A。

【点评】考查情态动词的基本用法。

38．— you like to drink some tea?

— Yes, please. Thanks very much.

A. Would

B. Can

C. Might

D. Must

【答案】 A

【解析】【分析】句意：——你想喝点茶吗？——是的。非常感谢。A 将要；B 能够，C 可以；D 必须。固定句型结构would like to do sth.，想要做某事，故选A。

【点评】考查情态动词的辨析。熟记常用的句型结构。

39．We _________wait until the traffic light turns green when we cross the road.

A. must

B. can

C. need

D. may

【答案】 A

【解析】【分析】句意:当穿过公路时，我们必须等到交通灯变绿。A. 必须，表示责任、义务，语气强烈;B.能，会，表示主语所具备的能力;C.需要;D.可以。为了生命安全，等到交通灯变绿再过公路是我们的责任和义务。故选A。

40．—Must I go there with you?

—No, you . David go with me.

A. mustn't; can

B. can't; must

C. don't; should

D. needn't; may 【答案】 D

【解析】【分析】句意：——我必须和你一起去吗？——不，不必。大卫可能和我一起去。情态动词must的一般疑问句，否定回答用needn't，情态动词may表示肯能，半肯半否的猜测，故选D。

【点评】考查情态动词，注意must的一般疑问句，否定回答用needn't的用法。

41．—Look! The man welcoming us at the school gate be our headmaster.

—No, it be him. He is having a meeting in the office now.

A. must; can't

B. must; mustn't

C. can't; mustn't

D. mustn't; can 【答案】 A

【解析】【分析】句意：——看，在学校门口欢迎我们的一定是我们的班主任。——不，不可能是他。现在他正在办公室开会。must一定，表示肯定推测；can't不可能，表示否定推测；mustn't禁止，不表示推测；can可能。根据He is having a meeting in the office now.可知班主任正在开会，所以不可能是班主任，所以第二个空用can't，根据no可知第一个人认为正在欢迎我们的一定是班主任，所以用must，故选A。

【点评】考查情态动词，注意平时识记，理解句意。

42．Recently people in China ____take much money on shopping because they often use Alipay （支付宝）

A. needn't

B. mustn't

C. shouldn't

D. can't

【答案】 A

【解析】【分析】句意：最近中国人没必要购物带许多钱，因为他们经常使用支付宝。A.没必要；B.禁止；C.不应该；D.不可能。因为有支付宝，所以人们购物时没必要带许多钱，故选A。

【点评】考查情态动词辨析，注意平时识记其词义，理解句意。

43．—Excuse me, could you tell me where I can buy a guidebook?

—Sorry, I'm new here. You _____ ask the policeman over there.

A. shall

B. can

C. must

D. need

【答案】 B

【解析】【分析】句意：——打扰一下，你能告诉我在哪里买导游书吗？——对不起，我是新来的，你可以问一下那边的警察。A.将要；B.能，可以；C.必须；D.需要。本句是一个建议，能够表达建议的使用can，故答案是B。

【点评】考查情态动词辨析，注意提出建议时可以用can或者may。

44．If you _______ the book, you _______ buy it right now, I think.

A. needn't; needn't

B. don't need; don't need

C. don't need; needn't

D. don't need; needn't to

【答案】 C

【解析】【分析】句意：如果你不需要这本书，我觉得现在你就没有必要买它。needn't是情态动词need的否定形式，后面跟动词原形；don't need是实意动词need的否定形式，后面跟to do sth.或者名词做宾语，根据句意可知应选C。

45．Look! The light in the room is still on. Mr. Liu at work.

A. must

B. can't be

C. must be

D. have to be

【答案】C

【解析】【分析】这题考查情态动词表示猜测的用法：can't be一定不是must be一定是，根据句意：看房间的灯还开着，说明刘先生一定还在工作。选C。

46．—________ I have a cup of tea, Miss Anderson?

—Of course. Here you are.

A. May

B. Must

C. Need

D. Should

【答案】 A

【解析】【分析】句意：——安德森小姐，我可以喝一杯茶吗？——当然。给。A可以，表询问、请求；B必须，表命令；C需要；D应该，表建议。根据 I have a cup of tea.我可以喝一杯茶，可知是请求，应用情态动词may，故选A。

【点评】考查情态动词辨析。注意掌握不同情态动词的用法。

47．—Hi，madam．Can I take the story books out？

—No，my boy．They _____ be taken out of the reading-room．It's a rule．

A. mustn't

B. needn't

C. couldn't

D. wouldn't

【答案】 A

【解析】【分析】句意：—嗨，夫人，我能把这些故事书拿出去吗？—不，孩子，他们不可以被带出阅览室，这是制度。A. mustn't不可以，禁止；B. needn't不必；C. couldn't不可能；D. wouldn't将不会．根据It's a rule，可知这是制度，所以你不可以把这些书带出去，

mustn't不可以，禁止，故答案选A。

【点评】考查情态动词，表示禁止应使用mustn't。

48．——Shall we meet at the station at 7 am?

——In fact, we _______. The train _______ until 9 a. m.

A. mustn't; doesn't leave

B. mustn't; leaves

C. needn't; won't leave

D. needn't; will leave

【答案】 C

【解析】【分析】need，需要，否定式是needn't；must的含义是必须一定，其否定形式mustn't表示禁止的含义。句意：我们上午七点在车站见面好吗？——实际上，我们不必。火车到上午九点钟才出发。结合语境可知后一空描述的是将要发生的动作，故用一般将来时态。选C。

【点评】情态动词的考查是初中英语考查的重点，平时学习中一定要熟记这些词的基本词义及用法上的不同，注意其用法及在句子中表达语气的不同。考试中结合语境选择合适答案。

49．—Where is George?

—He _______ be here just now. His coffee is still warm.

A. need

B. can't

C. must

D. shouldn't

【答案】 C

【解析】【分析】句意：——乔治在哪里？——他刚才一定在这里，他的咖啡还是热的。A. need需要； B. can't 不能，不可能（表示推测）； C. must 必须，一定（表示推测）； D. shouldn't不应该；根据His coffee is still warm.可知表示肯定推测一定在这儿；故答案为C。

【点评】考查情态动词。掌握情态动词表推测时的意义和用法。

50．—1ook! It be David in the classroom.

—It be him. Because I saw him in the library a moment ago.

A. may; mustn't

B. must; can't

C. need; can't

D. mustn't; can

【答案】 B

【解析】【分析】句意：——看！教室里一定是大卫。——不可能是他。因为我刚才在图书馆见过他。 may可以；must必须，一定；can能，可能；need需要；can't 不可能，不可以；mustn't禁止。根据下文I saw him in the library a moment ago.可知不可能是David，要用can't；所以上文一定是肯定的猜测，要用must （be）。故选B。

【点评】考查情态动词表示猜测的用法。理解情态动词的词义和用法，根据语境，选择正确的情态动词。

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