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--- Whose backpack is this?
--- It       be Mary’s. She is looking for hers.

A.can B.must C.may D.can’t 

B

解析试题分析:can可能,能够;must必须,一定;may可能;can’t不能,不可能。句意:这是谁的背包?根据下文,她正在找她的背包。可知前文指的是,它一定是玛丽的。故选B。
考点:考查情态动词

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