All the flights _____because of the snowstorm, we had to take the train instead. A、were canceled B、had been canceled C、having canceled D、having been canceled

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题目内容（安徽理工大学-金融学）

All the flights _____because of the snowstorm, we had to take the train instead.
A、were canceled
B、had been canceled
C、having canceled
D、having been canceled

参考答案

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华北水利水电-消防燃烧学