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 题目和参考答案——青夏教育精英家教网—

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

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