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问题: Tom is looking for his book.The book_____be Tom's .Look there is his name on the book cover

A.can't
B.might
C.could
D.must

为何会选B?请分析,谢谢!

解答:

Tom is looking for his book.The book_might____be Tom's .Look there is his name on the book cover

might:或许,也许,表示“可能”而不肯定,语气委婉