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—Whose book is this?

—It ________be Mary's. J. K. Rowling is her favorite writer.

—No, it ______ be hers . She never brings novels to school.

A. may, mustn't       B. can; can't

C. must; can't      D. must; mustn't

九年级英语单项填空中等难度题

少年,再来一题如何?
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