2. 考研
  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.

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问题 All flights ______ because of the snowstorm, many passengers could do nothing but take the train.
选项 A、had been canceled
B、have been canceled
C、were canceled
D、having been canceled
答案D
解析 本题空格处是说因为暴风雪，所有的班机都取消了。该题为"逻辑主语+doing"构成独立主格结构，表示原因。因此D项为正确答案。
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