选择题：— The door was open.— It （） open. I had locked it myself and

题目内容：

— 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

C.can't have been

D.mustn't have been

参考答案：【答案仅供学习，请勿对照自行用药等】

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