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8、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

8、C

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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

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


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-Did you knock on the door?

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

[  ]
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shouldn’t have been

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mustn’t have been

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couldn’t have been

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