It’s rather cold in the room. They______ have turned off the steam a few hours ago.

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问题 It’s rather cold in the room. They______ have turned off the steam a few hours ago.

选项 A、should
B、must
C、ought to
D、could

答案B

解析句意：屋子里相当冷，他们一定在几小时前关闭了暖气。考查must have done结构。这种结构表示对过去事情肯定性很强的推断。意思是“肯定，一定”。

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山东省大学英语三级

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