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    【题目】—It’s already twelve o’clock, and he ____________ have been here half an hour ago.

    —Maybe his flight was behind time.

    A. must B. ought to

    C. may D. can

    【答案】B

    【解析】考查情态动词。句意：——现在已经12点了。他半个小时之前就应该到这儿了。——也许他的飞机晚点了。根据对话内容，尤其是＂Maybe his flight was behind time.＂可知，用ought to/should have done sth结构表示＂过去本应该做某事而实际上没有做＂。故选B。

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