◎ 题干
— 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
◎ 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't B. won'tC. can't D. 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。