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【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】考查情態(tài)動詞。句意：——現在已經12點了。他半個小時之前就應該到這兒了。——也許他的飛機晚點了。根據對話內容，尤其是＂Maybe his flight was behind time.＂可知，用ought to/should have done sth結構表示＂過去本應該做某事而實際上沒有做＂。故選B。

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