题目内容
--- 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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