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
C
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”。
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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