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—Is Jack on duty today?
—It_____ be him. It’s his turn tomorrow.

A．mustn’tB．won’t C．can’tD．needn’t

C

解析試題分析：考查情態(tài)動詞表示推測：句意：--今天杰克值日嗎？--不可能是他。明天該輪到他。Can’t be用于否定推測“不可能是”，must表示推測的時候，表示“肯定是”，won’t不愿意，needn’t不必，選C。
考點：考查情態(tài)動詞表示推測

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