【单选题】【消耗次数：1】
All the flights _____because of the snowstorm, we had to take the train instead.
①
were canceled
②
had been canceled
③
having canceled
④
having been canceled
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【单选题】
All the flights ____ because of the snowstorm, we had
to take the train instead.
①
were canceled
②
had been canceled
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having canceled
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having been canceled
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The match was canceled because most of the members______a match without a standard court.
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some notes were prepared for Dr. Smith
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①
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