【題目】It is cold in the room. They ______ have turned off the heating.
A.must
B.ought to
C.should
D.could

【答案】A
【解析】句意：房間很冷，他們一定關(guān)了暖氣。must have+過去分詞，過去一定做過某事；ought to have +過去分詞=should have+過去分詞，表示過去“本來應該做的事情沒有做。”could have+過去分詞表示過去本來能夠做的事情沒有做。根據(jù)句意可知選A。

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