单项选择题

Living in the central Australian desert has its problems, () obtaining water is not the least.

A. of which
B. for what
C. as
D. whose

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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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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
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