"The door was open." "It _____ open. I had locked it myself and the key was in m

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问题 "The door was open." "It _____ open. I had locked it myself and the key was in my pocket."

选项 A、can’t be
B、mustn’t
C、can’t have been
D、mustn’t have been

答案 C

解析句子所用的是过去时，因此本句是对过去事情的否定推测，用can’t have done。

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