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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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
单项选择题
Young people often feel an urge to try （） before the age set by law.

A. a smoking
B. smoke
C. to smoke
D. smoking
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