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

--- 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

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

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