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“Is Jack on duty today?”“It ____ be him. It’s his turn tomorrow.”
A.mustn’tB.won’tC.needn’tD.can’t
D
本题考查情态动词。句中can’t表示“不可能”之意。句意:“今天杰克值日吗?”“不可能是他,明天轮到他。”
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