2. 外语
  3. All flights______because of the snowstorm, many passengers could do nothing but take the train.

All flights______because of the snowstorm, many passengers could do nothing but take the train.

admin2013-06-19  25
问题 All flights______because of the snowstorm, many passengers could do nothing but take the train.
选项 A、had been cancelled
B、were cancelled
C、have been cancelled
D、having been cancelled
答案D
解析 独立主格结构。该句逗号前是一个独立结构，逻辑主语是all flights，逻辑谓语的动作在那时也已完成，所以选择having been cancelled。
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