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:
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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