题目内容
— Is Jack on duty today?
— It ________ be him. It's his turn tomorrow.
A. mustn't B. won't C. can't D. needn't
【答案】
C
【解析】
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。
考点：考查情态动词表示推测
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