1.This key ____ be Peter's. His is still in the lock.

　　A.may not

　　B.can' t

　　C.mustn't

　　D.needn't

　　2.It's cold outside. You'd better ____ your coal.

　　A.not to take off

　　B.not take off

　　C.to not take off

　　D.don't take off

　　3.—— ____ I take the newspaper away?

　　----No, you mustn't. You ____ read it only here.

　　A.Must; can

　　B.May; can

　　C.Need; must

　　D.Must; must

　　4.—— ____ you like some more tea， sir?

　　----No, thanks.

　　A.Would

　　B.May

　　C.Must

　　D.Shall

　　5.——May I go now?

　　----No, you ____ . You ____ stay here.

　　A.needn't; has to

　　B.mustn't; have to

　　C.can't; must

　　D.needn't; must

　　6.——Must I write all the words down now?

　　----No, you ____ .

　　A.mustn't

　　B.can't

　　C.won't

　　D.needn't

　　7.——May I go out and play basketball now?

　　----No, you ____ finish your homework first.

　　A.must

　　B.can

　　C.may

　　D.need

　　8.You ____ worry about your son. He will get well soon.

　　A.needn't

　　B.can't

　　C.mustn't

　　9.—— ____ I come in， Mr Green?

　　----Yes, come in, please.

　　A.Must

　　B.May

　　C.Will

　　D.Need

　　10.He isn't in the school. I think he ____ be ill.

　　A.can

　　B.shall

　　C.must

　　11.“Must I come here before eight o'clock?”“No， you ____ .”

　　A.can't

　　B.couldn't

　　C.mustn't

　　D.needn't

　　12.I haven't brought my dictionary with me. ____ I use yours?

　　A.Must

　　B.Shall

　　C.May

　　D.Need

　　13.——You can't swim， can you?

　　----____.

　　A.Yes， I can't

　　B.No， I can't

　　C.Yes， you can

　　D.No， I can

　　14.He can hardly see anything， ____ ?

　　A.can't he

　　B.could he

　　C.can he

　　D.couldn't he

　　15.____ to have your lunch with me this afternoon?

　　A.Would you like

　　B.If you like

　　C.Did you like

　　D.Are you like

答案与解析：

1.B.can't在此表示“不可能”。 may not表示“不可以”，mustn't表示“不准”， needn't表示“不必”。

　　2.B.此题考查 had better的用法。 had better后接动词原形，表示“最好(做)……”， had better的否定形式是“had better not+动词原形”。 take off作“脱下(衣物)”讲。

　　3.B.may和can在疑问句和陈述句中都可表示“许可”。

　　4.A.Would you like? 表示委婉的邀请或征询意见。 B、 C、 D 三个选项中的助动词不能与like搭配。

　　5.C.A项的两个各选内容却不对。B项的错误是第一句虽然可用 mustn't，但第二空不能用 have to(表客观需要)。

　　6.D.

　　7.A.B方先说“不行(No)，后面就是”命令式的言辞，(must)，而不是说“可以(may)”做什么了。

　　8.A.后一句说“他很快就康复了”，还可推测出前一句应是“不必着急。”

　　9.B.在一般词句中用May表示“请求”。

　　10.C.must 是此处表示猜测，意为“一定是……”。

　　11.D.must的古定回答用 needn't.

　　12.C

　　13.B.在用Yes/No的答语中，前后的肯、否定形式必须一致。

　　14.C

　　15.A