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题文

---- Look! A man is cutting a tree on the moon.
----It ______ be true. The teacher said there is no air on the moon.

A.can’t B.may not
C.shouldn’t D.mustn’t
科目 英语   题型 单选题   难度 较易
知识点: 主语+系动词+表语 情态动词的被动语态 比较介词
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