题目内容

7．-Must we finish our homework now？
-No，you      ．（　　）
A．needn'tB．mustn'tC．can't

分析 -我们必须现在完成作业吗？
-不，你们不必．

解答 答案：A needn't不必；mustn't绝对不能，表禁止；can't不能．情态动词must开始的一般疑问句，否定回答要用needn't，表示不必．故选A．

点评 此题考查情态动词的用法，根据语法规则和句子的逻辑关系得出答案．

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