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

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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
单项选择题
As a public relations officer, he is said （） some very influential people.

A. to know
B. to be knowing
C. to have been knowing
D. to have known
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