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    精英家教网 > 高中英语 > 题目详情
    — Is Jack on duty today?
    — It ________ be him. It's his turn tomorrow.
    A．mustn'tB．won'tC．can'tD．needn't
    C

    试题分析：考查情态动词表示推测：句意：--今天杰克值日吗？--不可能是他。明天该轮到他。Can’t be用于否定推测“不可能是”，must表示推测的时候，表示“肯定是”，won’t不愿意，needn’t不必，选C。
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