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. ------ 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

--- 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

--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

 ---“The door was open.”

---“It ________ open, I ______ it myself and the key was in my pocket.”

A. can’t be, locked                B. mustn’t be, had locked    

C. can’t have been, had locked         D. mustn’t have been, locked

--- 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