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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

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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