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    18．-Is Jack on duty today？
    -It ________ be him．It's his turn tomorrow．（　　）
    A．mustn'tB．won'tC．can'tD．needn't

    分析 --今天杰克值日吗？
    --不可能是他值日．明天才轮到他．

    解答 答案：C．
    mustn't禁止，不许；won't，将不会；can't不可能；needn't不必．根据"It's his turn tomorrow"可知今天不可能是他值日；mustn't表"禁止"，常译为"不许"，不能表推测，can't不可能．故选C．

    点评 本题考查情态动词，要掌握情态动词的用法并结合具体的语境选择出正确的选项．

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