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    2．-Must I finish my homework before class is over？
    -No，you ______．You can hand it in tomorrow．（　　）
    A．mustn'tB．shouldn'tC．can'tD．needn't

    分析 --我必须在下课以前完成作业吗？
    --不，不必．你可以明天交．

    解答 答案：D．回答must的问句，肯定用yes，you must，否定用no，you needn't或you don't have to．所以答案是D．

    点评 考查情态动词．由must引出的一般疑问句，肯定回答用must，否定回答用needn't，don't need to或don't have to均可，但不用mustn't，因为mustn't表示"不许、禁止"的意思，与问句的原意不符．如：
    -Must I stay at home？我必须留在家里吗？
    -Yes，you must．是的，你必须留在家里．
    （No，you needn't．或No，you don't have to．）（不，不用了．）
    如果是反意疑问句，疑问部分一般不用needn't，而用mustn't；否定回答时仍用needn't，don't need to或don't have to．如：
    -You must go on foot，mustn't you？你必须走着去，是吗？
    -Yes，I must．是的，是这样．
    （No，I needn't．或No，I don't have to．） （不，不是的．）

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