. ------ The door was open.----- It open. I had locked it myself and the key was in my poc

问题补充：

. ------ The door was open.

----- It open. I had locked it myself and the key was in my pocket.

A. can’t be

B. mustn’t be

C. can’t have been

D. mustn’t have been

答案：

A. can’t be

B. mustn’t be

(答案→)C. can’t have been

D. mustn’t have been

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