题目内容
In the quiet darkness, I could hear someone _______ the door and go upstairs.
| A.open | B.to open | C.opened | D.to be opening |
A
解析
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题目内容
In the quiet darkness, I could hear someone _______ the door and go upstairs.
| A.open | B.to open | C.opened | D.to be opening |
A
解析