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—Whose book is this?
—It _____ be Mary’s. Mo Yan is her favorite author.
—No, it ____ be hers, she never brings novels to school.
A.may; mustn’tB.can; can’tC.must; can’tD.must; mustn’t
C

试题分析:句意:-这是谁的书?-它一定是Mary的,莫言是她最喜欢的作家。-不,不可能是她,她从来没有把小说带到学校来。本题考查情态动词表示推测的用法,在肯定句中表示有把握的推测用must;否定句中用can’t 表示不可能。must 不能用于否定句。故选C。
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