2. 专升本
  3. All flights ______ because of the storm, they decided to go to Beijing by train .

All flights ______ because of the storm, they decided to go to Beijing by train .

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问题 All flights ______ because of the storm, they decided to go to Beijing by train .
选项 A、having been canceled
B、had been canceled
C、having canceled
D、were canceled
答案A
解析 句子前半部分，非谓语动词之前有自己的逻辑主语，all flights(所有航班)，前半句句意为“因为暴风雨，所有航班已经被取消”，独立主格结构。Having been done强调了完成和被动。
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