2. 专升本
  3. All the flights______because of the snowstorm, we had to take the train instead.

All the flights______because of the snowstorm, we had to take the train instead.

admin2014-06-25  47
问题 All the flights______because of the snowstorm, we had to take the train instead.
选项 A、were canceled
B、had been canceled
C、having canceled
D、having been canceled
答案D
解析
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