题目内容
Unfortunately, all flights ______ because of the heavy snowstorm, hundreds of passengers had to stay at the airport.
A. have been canceled B. having canceled
C. canceled D. having been canceled
D

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题目内容
Unfortunately, all flights ______ because of the heavy snowstorm, hundreds of passengers had to stay at the airport.
A. have been canceled B. having canceled
C. canceled D. having been canceled
D