【題目】—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：——現(xiàn)在已經(jīng)12點(diǎn)了。他半個小時之前就應(yīng)該到這兒了�！苍S他的飛機(jī)晚點(diǎn)了。根據(jù)對話內(nèi)容，尤其是＂Maybe his flight was behind time.＂可知，用ought to/should have done sth結(jié)構(gòu)表示＂過去本應(yīng)該做某事而實(shí)際上沒有做＂。故選B。

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