单项选择题

If I had remembered （） the window, the thief would not have got in.

A. to close
B. closing
C. to have closed
D. having closed

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单项选择题
I’m sorry （） you waiting.

A. to keep
B. to be keeping
C. to have kept
D. to have been keeping
单项选择题
There was a knock at the door. It was the second time someone （） me that evening.

A. had interrupted
B. would have interrupted
C. to have interrupted
D. to interrupt
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