题目内容
1．-Must I return the book tomorrow morning？-No，you ____You can keep it longer．（ ）
| A． | mustn't | B． | can't | C． | needn't | D． | couldn't |
分析 句意：--明天上午我必须还书吗？
--不，不必．你可以借的时间更长一点．
解答 答案：C．
mustn't 表示禁止，不允许；can't表示禁止或者不可能，否定语气比mustn't弱；needn't 表示不必，couldn't表示不可能，否定语气比can't弱．
根据No，you ，You can keep it longer，可知明天上午不必还书，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．故选C．
点评 情态动词的考查．回答以must引导的一般疑问句，肯定回答用Yes，sb must．"是的，…必须"；否定回答用No，sb needn't"不，…不必"．
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