【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(dòng)詞。句意：已經(jīng)11點(diǎn)了，他半小時(shí)前就該到了。A. must have done必定做了…（表示對(duì)過去的推測(cè)）；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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