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–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’tB.may notC.shouldn’tD.mustn’t
A

試題分析:句意:看!一個人在月亮上砍樹。一定不是真的。老師說月亮上沒有空氣。A. can’t 表示否定猜測,一定不是  B. may not 不可能  C. shouldn’t 不應該 D. mustn’t一定不要做某事,表示禁止和勸告。情態(tài)動詞可以表示對事物的推測,肯定句中由情態(tài)動詞must/may/might+be 構成,意為“一定是,肯定是/也許是”,否定句由can’t+be構成。故選A。
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