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–Look! Someone is cutting a tree on the moon.
–It _______ be true, Granny. Our teacher says there is no air there.
A.can'tB.mustn'tC.mayD.should
A

试题分析:句意:看,有人在月亮上砍树。那不可能是真的,奶奶。我们老师说月亮上没有空气。Can’t 表示推测时,用于否定句,“不可能”;mustn’t 禁止,不要;may 可能;should 应该。根据句意,选A。
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