2. 外语
  3. All flights______because of the heavy snow, we had to take the train.

All flights______because of the heavy snow, we had to take the train.

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问题 All flights______because of the heavy snow, we had to take the train.
选项 A、were canceled
B、had been canceled
C、have been canceled
D、having been canceled
答案D
解析 本题考查非谓语动词。观察句子可知，这两个句子不是并列的分句，也不能构成复合句，后边是一个完整的句子，所以前边就应该用非谓语动词构成一个短语，在这里表原因，故选D。
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