-Why did you go back upstairs? -I thought I had left the window . [ ] A.openB.op
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![-Why did you go back upstairs? -I thought I had left the window . [ ] A.openB.op](/pic/43_949734.jpg)
-Why did you go back upstairs?
-I thought I had left the window ________.
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A.openB.openedC.being openedD.to be opened试题答案
答案:A