He isn't at school. I think he ___ be ill.

A. can B. shall C. must D. has to

C 【解析】句意：他不在学校上学，我认为他也许病了。A. can可能，表示推测时，往往用于否定句或疑问句； B. shall在陈述句第二、第三人称中表示说话者给对方的承诺、决心、警告、威胁等.如：I shall write to you again at the end of the month.月底我再给你写封信.；表示强制,用于法令、条约、规章中,意为“必须,应该”； C. must 一...

___ I take this one?

A. May B. Will C. Are D. Do

A 【解析】句意：--我可以要这个吗？--可以。A. May可以， May I+动词原形? 是表示请求对方许可的句型，多用于较正式的场合， 这个句型的肯定回答: (1) Certainly. Sure. (2) That’s OK/all right. (3) Yes, you may /can. (4)Yes, certainly.等。否定回答是: (1)Certainly not. (2...

The children___ play football on the road.

A. can't B. can

C. mustn't D. must

C 【解析】试题分析：mustn't：表示禁止、不允许。句意：孩子们禁止在马路上踢足球。故选C

You ___ be late for school again next time.

A. mustn't B. needn't

C. don't have to D. don't need to

A 【解析】句意：下次你上学不要迟到了。A. mustn't禁止，不应该；表示的是语气很强烈的； B. needn't不必（表示没必要）；强调客观条件。常做must问句的回答:Must I finish my homework today? No, you needn’t或. No, don't have to来回答；C. don't have to不必； D. don't...

—Must I do my homework at once? —No, you___.

A. needn't B. mustn't C. can't D. may not

A 【解析】句意：--我必须马上做完作业吗？--不必了。A. needn't不必； B. mustn't禁止，不应该；回答Must I…?的否定回答可以用No, you. needn't/No, you. don't have to； C. can't不可能； D. may not也许不。以must引出的一般疑问句，其肯定回答一般用must来回答。故选A。

His arm is all right. He___ go and see the doctor.

A. has not to B. don't have to

C. haven't to D. doesn't have to

D 【解析】句意：他的胳膊好了，他没有必要去看医生了。A. has not to没有这种表达方式，故排除A； B. don't have to不必；C. haven't to没有这种表达方式，故排除C； D. doesn't have to不必。根据His arm is all right胳膊好了，没有必要不看医生了。句子的主语是第三人称单数he，所以谓语动词也用单数形式。故排除C。故选D。...

He had to give up the plan, ___ he?

A. did B. didn't C. does D. doesn't

B 【解析】句意：他不得不放弃这个计划，好吗？这里是反义疑问句，陈述部分有have to +v. (had to + v.)，疑问部分常用don't +主语（didn't +主语）。如：We have to get there at eight tomorrow, don't we?因为前面是had to，所以后半部分用didn't，故选B。

They had to walk here, ___ they?

A. mustn't B. did C. didn't D. hadn't

C 【解析】句意：他们不得不步行去那里，是吗？mustn't禁止，不应该；这里是反义疑问句，陈述部分有have to +v. (had to + v.)，疑问部分常用don't +主语（didn't +主语）。如：We have to get there at eight tomorrow, don't we?因为前面是had to，所以后半部分用didn't，故选C。

He had better stay here, ___ he?

A. doesn't B. don't C. hadn't D. isn't

C 【解析】句意：他最好呆在这里，好吗？这里是反义疑问句，陈述部分有had better + v. 疑问句部分用hadn't you?如：You'd better read it by yourself, hadn't you?故选C。

You’d better ________late next time .

A. not to be B.not be C. won’t be D. don’t be

B 【解析】 试题分析：句意：你最好下一次不要迟到。had better （not）do sth最好（不要）做某事，所以选B。