【題目】—It’s already 11 o’clock , and he ______ have been here half an hour ago.

—Maybe he got caught in the rain.

A. must B. ought to

C. may D. can

【答案】B

【解析】

考查情態(tài)動詞。句意：已經(jīng)11點了，他半小時前就該到了。A. must have done必定做了…（表示對過去的推測）；B. ought to have done 本應(yīng)該做的；C. may have done可能已經(jīng)做過某事；D. can have done本來可以做的（但沒有做），根據(jù)題意，故選B。

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