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— 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

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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