Question

--Must I wait here until three o~clock?

--No, you         . You can leave now.

A. needn't    B. mustn't    C. can't    D. shouldn't

Answer

A

【解析】句意：——我必须在这里等到三点钟吗？——不，你不必，你现在可以走了。A. needn't不必；B. mustn't不可以；C. can't不可能；D. shouldn't不应该．根据答语“You can leave now，”可知你现在可以走了，所以不必等到3点，在这里是作出否定回答．由must引导的一般疑问句表示否定回答时需要用needn't或don't have to来回答，故答案选A。

点睛：1. 回答must开头的一般疑问句时，肯定回答用must，否定回答用needn't或don't have to. 如：1)—Must I finish my homework before eight o'clock?—Yes, you must.

2)—Must I attend the meeting?—No, you needn't(No, you don't have to). You can ask Tom to go instead.

2. 在回答may开头的一般疑问句时，肯定回答用may，否定回答用mustn't. 如：

1)—May I watch TV after supper? —Yes, you may. / No, you mustn't.

2)—May I stop here? —No, you mustn't.

3. 在回答need开头的一般疑问句时，肯定回答用must，否定回答用needn't. 如：

1)—Need we stay behind after school? —Yes, you must.

2) —Need he go now? —No, he needn't.