题目内容


“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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