语法知识—情态动词的经典测试题含答案解析
英语情态动词含答案解析
英语情态动词含答案解析一、情态动词单项选择题1．—Robert, could you help me wash the car?—Of course, I ________. I’m coming, dad.A．could B．should C．can D．need【答案】C【解析】【详解】句意：——罗伯特，你能帮我洗车吗？——当然可以。
我来了，爸爸。
考查动词辨析和一般疑问句。
could能，过去式；should应该；can能，原形；need需要。
问句“could you help me wash the car”中的could表示委婉，肯定回答应用“can”，故选C。
2．You’d better ________ it with your parents before you make a decision.A．discuss B．to discuss C．discussed D．discussing【答案】A【解析】【详解】句意：你最好先和父母商量一下再做决定。
考查非谓语。
you’d better do sth“最好做某事”，空格处应用原形，故选A。
3．— Must I go to music school and be a teacher like you, Dad?—No, you ________, son. You’re free to make your own decision.A．can’t B．needn’t C．mustn’t【答案】B【解析】【分析】【详解】句意：——我必须去音乐学校，像你一样当老师吗，爸爸？——不用，儿子。
你可以自由地做自己的决定。
考查情态动词。
can’t 不能，不可能；needn’t 不必；mustn’t 一定不，表示禁止做某事。
根据“You’re free to make your own decision.”可知，不需要像爸爸一样当一名老师，结合选项，needn’t符合句意。
英语情态动词含答案解析
英语情态动词含答案解析一、情态动词单项选择题1．一There is somebody knocking at the door. Who ________ it be?一I'm not sure. But it ________ be a delivery man(快递员). I bought something on Pin Duoduo. A．may; must B．must; can C．can; may D．must; may【答案】C【解析】【分析】【详解】句意：——有人在敲门。
会是谁呢？——我不确定。
但可能是快递员。
我在拼多多上买了些东西。
考查情态动词。
may可能；可以；must必须；一定；can可能，能。
第一句话是特殊疑问句，表示“可能”，应用can；根据答语中“I’m not sure”可知，第二个空用may表示“可能”。
故选C。
2．—My legs hurts, and I ________ see very well. Will I go blind?—No, you’ve just hit your head.A．may B．can C．may not D．can’t【答案】D【解析】【详解】句意：——我的腿疼，我看不太清楚。
会失明吗？——不，你只是撞到了头。
考查情态动词。
may可以；can能；may not可能不；can’t不能；根据“Will I go blind?”可知，此处说的是看不清楚，空处表达的是“不能”，应用can’t，故选D。
3．—________ you please tell me something about the life in Canada?—Sorry, I ________. I don’t know either. I’m from Australia.A．Could; couldn’t B．Can; couldn’t C．Could; can’t D．Can; mustn’t【答案】C【解析】【详解】句意：——你能给我讲讲加拿大的生活吗？——对不起，我不能。
高考情态动词单选20题答案解析版
高考情态动词单选20题答案解析版1. She ______ know the answer. She always gets good grades in English.A.mustB.canC.mayD.could答案：A。
选项A“must”表示肯定的推测，意为“一定”，根据后句她英语总是得高分，可以推断她一定知道答案。
选项B“can”表示能力，“能、会”；选项C“may”表示可能性较小的推测，“可能”；选项D“could”表示过去的能力或委婉的请求等。
2. You ______ finish your homework before you watch TV.A.mustB.canC.mayD.could答案：A。
“must”在这里表示“必须”，在看电视之前必须完成作业。
选项B“can”表示能力或允许；选项C“may”表示可能或允许；选项D“could”表示过去的能力或委婉的请求等。
3. He ______ be at home. I just saw him go out.A.mustn'tB.can'tC.may notD.couldn't答案：B。
“can't”表示否定的推测，“不可能”，因为刚刚看到他出去了，所以他不可能在家。
选项A“mustn't”表示禁止；选项C“may not”表示可能性较小的否定推测；选项D“couldn't”表示过去的否定推测，语气比“can't”弱。
4. —______ I use your pen?—Sure. Here you are.A.MustB.CanC.MayD.Could答案：B。
这里表示请求，“我能使用你的钢笔吗？”“can”可以用于请求允许。
选项A“must”表示必须；选项C“may”也可以用于请求允许，但语气比“can”弱；选项D“could”用于委婉的请求。
5. She ______ have forgotten to bring her book. She is always very careful.A.mustn'tB.can'tC.may notD.couldn't答案：B。
英语情态动词含答案解析
英语情态动词含答案解析一、情态动词单项选择题1．It’s quite cold outside. You’d better ________ the windows or the door.A．open B．not to open C．don’t open D．not open【答案】D【解析】【详解】句意：外面很冷。
你最好不要打开窗户或门。
考查固定句型，open v. 开。
had better (not) do sth.最好(不)做某事，根据“It’s quite cold outsi de.”可知应该是最好不要开窗户或门，故选D。
2．—I cannot find my pen. ________ I borrow yours?—Sure.A．Can B．Must C．Should D．Would【答案】A【解析】【详解】句意：——我找不到我的钢笔。
我可以借你的吗？——当然。
考查情态动词辨析。
can可以；must必须；should应该；would将。
根据“I borrow yours”可知，此处应用can表请求允许，希望能借对方的钢笔用一下，故选A。
3．—Is that Miss Liu over there?—No. It ________ be her. She has gone to the USA．A．mustn't B．can't C．won't D．needn't【答案】B【解析】【分析】【详解】句意：——是刘小姐在那边吗？——不是。
那不可能是她。
她去美国了。
考查情态动词。
mustn’t不准；can’t不可能；won’t将不；needn’t没必要。
根据“She has gone to the USA她去美国了”可知那不可能是刘小姐，应用“can’t”表示否定推测。
故选B。
4．—Look, the lady in red ________ be our English teacher.—No, she________be. She is in the office now.A．must; can’t B．can; mustn'tC．may; mustn’t D．shall; can’t【答案】A【解析】【详解】句意：——看，穿红衣服的那位女士一定是我们的英语老师。
高中英语情态动词形式单选题60题(含答案)
高中英语情态动词形式单选题60题(含答案)1.She ____ be very tired after such a long journey.A.mustB.canC.couldD.might答案：A。
“must”在这里表示肯定的推测，“她在这么长的旅途之后一定很累”。
“can”表示能力、可能性，在此处不太符合语境；“could”表示过去的能力、可能性或委婉语气，也不太符合；“might”表示可能性较小的推测。
2.He ____ speak French fluently when he was young.A.mustB.canC.couldD.should答案：C。
“could”表示过去的能力，“他年轻时能流利地说法语”。
“must”表示肯定的推测，不符合；“can”表示现在的能力；“should”表示应该。
3.You ____ finish your homework before you watch TV.A.mustB.canC.could答案：A。
“must”表示必须，“你必须在看电视之前完成作业”。
“can”表示能力、可能性；“could”表示过去的能力、可能性或委婉语气；“may”表示可能。
4.____ I borrow your pen?A.MustB.CanC.CouldD.Will答案：B。
“Can I...?”表示请求，“我能借你的笔吗？”“Must”表示必须，语气太强；“Could”用于更委婉的请求，但不如“Can”常用；“Will”表示将来。
5.She ____ have forgotten her keys. She's always so careful.A.can'tB.mustn'tC.shouldn'tD.needn't答案：A。
“can't”表示否定的推测，“她不可能忘了钥匙，她总是很细心”。
“mustn't”表示禁止；“shouldn't”表示不应该；“needn't”表示不必。
初中英语情态动词专项练习(附答案解析)
初中英语情态动词专项练习（附答案解析）一、单选题1．—Must I hand in the homework right now?—That's the rule.A．Yes, you can.B．No, you can't.C．Yes, you must.D．No, you mustn't.1．答案C解析句意：—我必须现在交作业吗？—这是规则。
是的,，你必须。
A. Yes,you can.“是的,你能”；B. No,you can't.“不,你不能”；C. Yes,you must.“是的,你必须”；D. No,you mustn't.“不,你禁止”。
回答must引导的一般疑问句，肯定用must，表示"必须"。
故选C。
点评考查情态动词引导的一般疑问句的回答，掌握情态动词must的用法。
2．You don't look well, you __________ see the doctor.A．ought to B．may C．can D．Might 2．答案A解析句意：你看起来不好，你应该去看看医生。
根据“看起来不好”可以得知是应该去。
A. ought to “应该”；B. may “可能”；C. can“ 会”；D. might“可能”。
故选A。
点评考查情态动词，区分ought to；may ；can和might的含义和应用。
3．What a beautiful day! You ______ take your umbrella at all.A．needn't B．mustn't C．can't D．may not 3．答案A解析句意：多好的天气啊!你根本不需要带伞。
A. needn't “不必”；B. mustn't“禁止”；C. can't“不可能”；D. may not“或许不会”。
情态动词测试题及答案
情态动词测试题及答案一、选择题1. You _______ be careful when you cross the street.A. canB. mustC. shouldD. may答案：B2. She _______ be at home now because she called me a moment ago.A. canB. mustC. mightD. could答案：B3. I _______ finish my homework before I go out to play.A. canB. mustC. wouldD. should答案：B4. You _______ wait for me at the bus stop; I'll be there infive minutes.A. needB. mustC. canD. may答案：C5. They _______ have finished their work by now.A. canB. mustC. shouldD. might答案：C二、填空题6. It’s cold outside. You _______ wear a coat.答案：should7. The doorbell rang, _______ it be the postman?答案：could8. _______ you tell me the way to the library?答案：Could9. I _______ go to the party, but I have to finish my report first.A. canB. mustC. wouldD. should答案：C10. _______ I borrow your pen for a moment?答案：May三、改错题11. He can go to the concert, but he must to stay at home.错误：to stay正确：must stay12. She might have finished her work, but I think she should be working now.错误：might have finished正确：may have finished13. You should to call your parents before you leave.错误：to call正确：should call14. I would like to go to the beach, but I can’t afford it.错误：would like正确：could15. They must have been at the meeting, but they were actually at the cinema.错误：must have been正确：could have been四、翻译题16. 他可能已经完成了他的作业。
（完整版）情态动词专项练习（含答案）
（完整版）情态动词专项练习（含答案）1. I promised to get there before 5 o’clock, but now the rain is pouring down. They ______ for me impatiently.A. may waitB. ought to waitC. could waitD. must be waiting2. He was very brave. Even though she’d hurt her leg, she ________ go back alone.A. couldB. mightC. have toD. was able to3. You ________ pay too much attention to your reading skill, as it is so important.A. cannotB. shouldC. mustD. needn’t4. I’ve tried several times, but the car just _______.A. doesn’t startB. wouldn’t startC. won’t startD. didn’t start5. Always the old lady ______ sit for hours doing nothing at all.A. was used toB. wouldC. used toD. should6. There used to be a small school,___________?A. was thereB. wasn’t itC. usedn’t thereD. usedn’t it7. Our house is on the top of the hill, so in summer the wind _____ be pretty cold.A. mustB. canC. ought toD. need8. Haven’t I told you that you __________ have the ans wer tomorrow morning?A. willB. shallC. shouldD. would9. I’m surprised that he _______ in the match.A. should failB. should have failedC. would have failedD. may have failed10. Better go to see my sick colleague right now, ________I?A. hadn’tB. didn’tC. don’tD. won’t11. Sir, you ______ be hunting deer here, for they are preserved by the government.A. oughtn’t toB. can’tC. won’tD. needn’t12. Sorry I’m late. I ______ have turned off the alarm clock and gone back to sleep again.A. mightB. shouldC. canD. will13. —There were already five people in the car, but they managed to take me as well.— It __________ a comfortable journey.A. can’tB. shouldn’t beC. must have beenD. couldn’t have been14. To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.A. canB. wouldC. mightD. should15. ____ three people who travel together, there _____ be at least one who ____ be my teacher.A. Between; can; willB. In; should; couldC. Among; will; mayD. Of; must; can16. —Could you lend me that book you ______ me aboutwhen I telephoned you?—No, I am sorry, I can’t. I gave it to a friend.A. were tellingB. would tellC. had toldD. had been telling17. —We need a person badly to think up such an idea.—_______ the new comer have a try?A. ShallB. MayC. ShouldD. Need18. We ________ so tired. We’ve only been to a party.A. mustn’t have feltB. wouldn’t have feltC. shouldn’t have feltD. couldn’t have felt19. Professor Smith, many students want to see you. __________ they wait here or outside?A. DoB. ShallC. WillD. Would20. —How about paying a visit to Mr. Richardson, our former history teacher?—Good idea. I will e-mail him today so he _____know _________ to expect us.A. shall; whyB. may; whenC. would; whyD. will; how21. —I went to work on foot yesterday, though it _________ cats and dogs.—You __________ by bus. It was likely to get a cold.A. is raining; must have goneB. rained; would goC. was mining; should have goneD. have rained; could have gone22. You ______ pay too much attention to your reading skill, as it is so important.A. cannotB. shouldC. mustD. needn’t23. I told Sally to fix him up with this job, but perhaps I _________ it out for her.A. had to writeB. must have writtenC. should have writtenD. ought to write24. My sister met him at the Grand Theatre yesterday afternoon, so he ________ your lecture.A. couldn’t have attendedB. needn’t have attendedC. mustn’t have attendedD. shouldn’t have attended25. Research findings show we spend about two hours dreaming every night, no matter what we ________ during the day.A. should have doneB. would have doneC. may have doneD. must have done26. —Is there any flight to Tokyo today?— I think there _____, for the weather is too bad.A. mustn’t beB. mightn’t beC. needn’t beD. can’t be27. —I’m told that John had another car accident this morning.— I believe not. He _____ so careless.A. shouldn’t have beenB. wouldn’t have beenC. couldn’t have beenD. mustn’t have be en28. It was playing computer games that cost the boy a lot of time that he __________ doing his lessons.A. might have spentB. ought to have spentC. must have spentD. could have spent29. —I didn’t know you were good friends.—You _______. I have known her since she moved here. You were studying abroad then.A. may haveB. needn’t haveC. couldn’t haveD. must have30. They must have finished the work by the end of last month, __________?A. mustn’t theyB. haven’t theyC. hadn’t theyD. didn’t they31. —I didn’t see her yesterday.— Of course, you _____, because he had gone for a trip.A. can’tB. may not haveC. can’t haveD. mustn’t have32. You ________ phone him if you want to, but you _________. He is sure to phone you.A. may; mustn’tB. have t o; needn’tC. can; doesn’t needD. can; needn’t33. — She must have gone back to the valley.— ______, she _____ have. The entrance to it was nowhere to be found.A. No; mustn’tB. Yes; mightC. Yes; couldD. No; couldn’t34. He _____ full marks, but he was so careless as to make a spelling mistake.A. must have gainedB. can have gainedC. could have gainedD. must gain35. From what you said, she _____ you about it.A. mustn’t have toldB. can’t have toldC. mustn’t tellD. can’t tell36. — You ought to have made an apology to Tom yesterday evening.— Yes, I know I _________.A. ought toB. have toC. should haveD. must have37. —Is there a fog in the evening?—There _______ be. I’ll make a phone call to find it out.A. mustB. wouldC. willD. might38. — _______ he help you with the problem?—Well, though it is very hard, __________ I’ll do what I can to work it out.A. Shall; butB. Can; andC. Must; howeverD. Will; still39. —How is that, Joan?—Yeah, it’s from the boss. She _________ first, whether she likes it.A. shall goB. ought to have goneC. should goD. must have gone40. —Would you like to watch the video, in which you can see foreigners making jiaoji during the Spring Festival?—Sure, it ______ be very interesting.A. shouldB. mayC. canD. will41. —The door was open.—It _________ open. I had locked it myself and the key was in my pocket.A. can not beB. must not beC. can not have beenD. must not have been42. —Where ________ Margaret have put the empty bottles?—She ________ them away. They must be somewhere.A. can; can’t have thrownB. must; needn’tC. must; must have thrownD. cant; must throw43. —Mum, I climbed to get the Teddy Bear from the top of the shelf.—My goodness! You _______ yourself. You ______ do that next time.A. mu st have hurt; mustn’tB. should have hurt; can’tC. may have hurt; mustn’tD. might have hurt; won’t be able to44. —Shall I go and buy more food and drinks for the party?—No, we have prepared a fridge of those. That _______ be quite enough.A. canB. mayC. mightD. ought to45. —Hurry up, Michael! It’s ten to three.—Goodness me! The class_______. I’ll be late again.A. must beginB. may beginC. should have begunD. must have begun46. When he was there, he ____ go to that coffee shop at the street comer after work every day.A. wouldB. shouldC. had betterD. might47. —I hear you have written a novel.—Yes, the book ________ be out in a month or so.A. canB. dareC. shouldD. need48. —How could I thank you enough?—Don’t mention it. Any other man _________ that.A. must doB. could doC. would have doneD. should have done49. —Why aren’t they here yet?—They ________ the bus.A. can have missedB. must be late forC. may have missedD. might be late for50. Mike _______ come to see me I don’t want to go out in case he comes.A. canB. mustC. mayD. will51. The thief ________ in from the kitchen window as the door was closed.A. may climbB. must have climbedC. could have climbedD. should have climbed52. —You didn’t invite Bill?— __________ him too?A. Must I inviteB. Must I have invitedC. Should I inviteD. Should I have invited53. —Why didn’t you attend the lecture yesterday?—I didn’t think that we _______ on Sundays.A. shouldB. ought to haveC. shouldn’t haveD. will have to54. It’s said that there are plenty of hotels in that town. There ______ be any difficulty for you to find somewhere to stay.A. wouldn’tB. mustn’tC. shouldn’tD. needn’t55. —Would you be here to attend the English party this evening?—Yes, we _________.A. shallB. wouldC. willD. must56. On Sundays when I was a child, Father and I _______ get up early and go fishing.A. couldB. wouldC. mightD. should57. —You’d better keep quiet in class.—Sometimes I ________ Yesterday, I was very quiet during my English class.A. wouldB. doC. didD. have58. I lived with my sister this summer and didn’t have to pay rent. So I ______ save most of my salary.A. couldB. wouldC. was able toD. should59. —Look, John’s fallen asleep.— Oh, he _______ too late last night.A. might sit upB. should have sat upC. could sit upD. must have sat up60. —I posted the letter a week ago.—Then they __________ the letter by now. It usually takes four days.A. can have receivedB. must receiveC. should receiveD. ought to have received61. He used to teach in that university and I _________ ride past it on my way to work.A. wouldB. couldC. shouldD. might62. —So you have to leave now.—Yes, I __________.—How nice it would be if you could stay a bit longer!A. have toB. ought toC. doD. have63. He _______ Shanghai, for I saw him talking with the headmaster a moment ago.A. must have gone toB. can’t have gone toC. mustn’t have been toD. can’t have been to64. From what I learn about their hotel, the service and the weather, they _____ their holiday very much.A. wouldn’t have enjoyedB. shouldn’t have enjoyedC. needn’t have enjoyedD. can’t have enjoyed65. It is not like Jack to be unfriendly, so he _________ you when you called.A. can’t have seenB. should not have seenC. must not have seenD. need not have seen66. —Many people in England love to give advice on weather reporting.—Yes, but I think the weather office’s computers _________ be more accurate.A. canB. mustC. ought toD. might67. —The farmers lived near the high way.—________ very noisy.A. It must have beenB. They must beC. That might beD. There must be68. She is too slow. She ________ pass the test, but she __________ too little.A. would; knewB. will; knowsC. would; knowsD. will; knew69. —Mary didn’t turn up last time, did she?—No. She_________. We had changed our plan.A. shouldn’t have comeB. needn’t have to comeC. didn’t need to comeD. needn’t have come70. —They haven’t finished the work up to now.—Well, they________.A. shouldB. should haveC. wouldD. must have71. —Shall I go and buy more fruit for the party?—No, I have already bought 3 baskets. That _________ be enough.A. canB. ought toC. mayD. might72. —Why hasn’t the speaker turned up?—He _________ the flight. I’ll find it out at once.A. must have missedB. might have missedC. would have missedD. could have missed73. I _______ pay Tom a visit, but I am not sure whether I will have time this Sunday.A. shouldB. mightC. wouldD. could74. —Who is the girl standing over there?— Well, if you _____ know, her name is Mabel.A. mayB. canC. mustD. shall75. It has been announced that candidates (考生)________ remain in their seats until all the papers have been collected.A. canB. willC. mayD. shall【答案解析】1．D。
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18．(2017·甘肃白银·10)—I wonder if these are Danny's glasses.
—They________be Danny's. He doesn't wear glasses.
A．can'tB．mustC．mustn'tD．can
考查情态动词表示推测。can表示能、可以；may表示可能，might是其过去式；must表示一定、必须。根据题干中but I'm not sure．可知可能性较小的推测，则可用may或者might，B项中may后有系动词be，原句中有动词like，则只能用might。故选C。
9．D
解析：D
【解析】
【分析】
---No, you. Tomorrow is Sunday and you may have a rest today.
A．shouldn’tB．mustn’tC．can’tD．don’t have to
10．—Must I finish my homework this evening?
—No,you ________.You have a three﹣day holiday.
【详解】
句意：——看！史密斯太太正站在教学楼的前面。——不可能是他。她去埃及度假了。
考查情态动词表示推测。must be一定是；mustn’t be禁止是；can be可能是；can’t be不可能是。根据She has gone to Egypt for her holiday.可知她去了埃及，不可能站在教学楼前，故选D。
A．mayB．mustC．canD．ought to
13．Isee the blackboard. I need to have my glasses.
A．canB．can’tC．mustD．mustn’t
14．Helike coffee. I see him drink a cup at times.
—Don’t worry! The new．must notB．may notC．needn’tD．will not
3．(2018·山东临沂) Could you please speak a little louder? I ______ hear you very well.
句意：你已经完成了大部分工作，所以你明天不必这么早就开始工作。你可以9点来。
本题考查情态动词。can't不可能，mustn’t禁止，needn’t不必，couldn’t可能不。根据You have finished most of the work可知，你已经完成了大部分工作，因此明天不必这么早就开始工作，因此用needn’t，故选C。
7．A
解析：A
【解析】
【详解】
句意：——我驾照考试又失败了。——别担心。就像天气一样，生活也不可能一直是美丽的。
考查情态动词。can't不可能；needn't不必；shouldn't不应该；mustn't一定不能。根据句意，应是不可能一直美丽。故选A。
8．C
解析：C
【解析】
【详解】
句意：乔的生日我给她买了一条漂亮的项链。她可能会喜欢，但是我不确定。
A．mustB．mayC．can’tD．mustn’t
15．—Look! Mrs. Smith is standing in front of the teaching building.
—It______ her. She has gone to Egypt for her holiday.
A．must beB．mustn’t beC．can beD．can’t be
---It ______ true because there was little snow there.
A．may not beB．won’t beC．couldn’t beD．will be
21．— Mum, I’ve signed for a big box by Future Express (快递). What’s in it?
A．can’tB．mustn’t
C．shouldn’tD．needn’t
4．Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.
A．mustn’tB．ought not toC．needn’tD．don’t have to
【详解】
句意：——妈妈，我今天必须完成作业吗?——不，你不必这么做。明天是星期天，你今天可以休息一下。考查情态动词辨析。A. shouldn’t不应该，表建议；B. mustn’t一定不，表禁止；C. can’t不能，表示不允许；D. don’t have to不必，指没有必要。回答must引起的一般疑问句，如果要作否定回答，一般是用needn’t（不能用mustn’t）或not have to。根据句意语境，可知选D。
6．D
解析：D
【解析】
【详解】
句意：——我不能戒烟，医生。——为了你的健康，恐怕你得这么做。
考查情态动词辨析。must必须，强调主观意愿；can能，表能力或许可；need需要，指有必要；have to必须，强调客观需要。根据“For your health为了你的健康”，可知无论愿不愿意戒烟是健康所需，故选D。
―For your health, I'm afraid you.
A．mustB．canC．needD．have to
7．―I didn’t pass the driving test again.
―Don't worry. Just like the weather, lifebe beautiful all the time.
A．can’tB．mustn’tC．needn’tD．may not
【参考答案】***试卷处理标记，请不要删除
一、选择题
1．B
解析：B
【解析】
【详解】
句意：你应该因为上学迟到向老师道歉。
本题考查动词短语。apology道歉，是名词；apologize道歉，是动词；about关于，for为了，on在……上面。apologize to sb for sth“因为某事向某人道歉”，位于情态动词should后，用动词原形，故选B。
2．B
解析：B
【解析】
【详解】
句意：——你听说过2020年地球的温度将上升到59摄氏度吗?——不要担心。那个消息可能不是真的。
考查情态动词。must not禁止；may not可能不是。needn’t不必；will not将不会。根据“Don’t worry”可知，这里是这个消息可能不是真的,表示一种推测。根据题意，故选B。
16．-Could you help me with my English homework, Nancy?
-Of course I____________. Glad to help.
A．couldB．canC．mustD．do
17．—I feel tired.
—You ________ go to bed so late.
解析：A
【解析】
【分析】
【详解】
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。mustn’t禁止，不允许；ought not to不应该，不应当；needn’t不必；don’t have to不必。根据“No Smoking!”可知此处禁止吸烟，所以选A。
5．C
解析：C
【解析】
【详解】
— I’m not sure. It ________be a present from your brother.
A．needB．mustC．mayD．will
22．—Can I take some milk and biscuits to the reading room?
—No, our school has a rule that students _______ eat or drink there.
【解析】
【详解】
句意：牛奶味道不好。你最好把它扔掉。
考查had better和人称代词宾格。throw away意为“扔掉”，根据所给空前面的had better后面接动词原形，排除B和D，由milk是不可数名词，所以用it来代指，排除C，故选A。
12．B
解析：B
【解析】
【分析】
【详解】
句意：对不起，超过1.4米的孩子必须为演出付全价。
A．can'tB．needn'tC．shouldn'tD．mustn't
8．I’ve bought a nice necklace for Jo’s birthday. She _____like it, but I’m not sure.
A．canB．may beC．mightD．must
9．---Mum, must I finish my homework today?
10．C
解析：C
【解析】
【详解】
句意：——今天晚上我必须完成作业吗？——不，你不必。你有三天的假期。
考查情态动词词义辨析。won't将不；mustn't禁止；needn't不必。根据句意"今天晚上我必须完成作业吗?不，你不必。你有三天的假期"可知。要填"不必"，其它选项语意不通。故选C。
11．A
解析：A
14．B
解析：B
【解析】
【详解】
句意：他可能喜欢咖啡。我看见他有时喝一杯。A. must必须；B. may可能；C. can’t不能；D. mustn’t禁止。根据下文I see him drink a cup at times.可知上文是可能喝咖啡。根据题意，故选B。