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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

試題分析：句意:-這是誰的書？-它一定是Mary的，莫言是她最喜歡的作家。-不，不可能是她，她從來沒有把小說帶到學校來。本題考查情態(tài)動詞表示推測的用法，在肯定句中表示有把握的推測用must;否定句中用can’t 表示不可能。must 不能用于否定句。故選C。
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