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【题目】 ---Is Jack on duty today?

---It ________ be him. It's his turn tomorrow.

A.mustn'tB.won'tC.can'tD.needn't

【答案】C

【解析】

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,故选C

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