题目内容

-Did you knock on the door?

-No.There was no light on.There ________ somebody at home.

[  ]
A.

shouldn’t have been

B.

mustn’t have been

C.

couldn’t have been

D.

couldn’t be

答案:C
解析:

根据语境可知此处是对过去发生动作的推测。故选C项。意为“当时家中不可能有人”。


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