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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】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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