In the quiet darkness, I could hear someone the door and go upstairs.A. openB. to openC.

发布时间：2020-08-16 08:28:00


In the quiet darkness, I could hear someone      the door and go upstairs.
A. open
B. to open
C. opened
D. to be opening

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(答案→)A. open
B. to open
C. opened
D. to be opening
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