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
All flights()because of the snowstorm, we decided to take the train.

A. were canceled
B. had been canceled
C. having canceled
D. having been canceled
单项选择题
They()to enter the building by the back door; however, the back door was locked.

A. weren’t supposed
B. wouldn’t be supposed
C. were supposed
D. would be supposed
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