◎ 题干
— Is Jack on duty today?
— It ________ be him. It's his turn tomorrow.
A.mustn'tB.won'tC.can'tD.needn't
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ — Is Jack on duty today? — It ________ be him. It's his turn tomorrow.A.mustn'tB.won'tC.can'tD.needn't…”主要考查了你对  【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。