All flights ________ because of the snowstorm, many passengers could do nothing but take the train. ( 章节：3 难度：3)
- A、were canceled
- B、had been canceled
- C、having been canceled
- D、have been canceled
正确答案:C
答案解析:有
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All flights ________ because of the snowstorm, many passengers could do nothing but take the train. ( 章节：3 难度：3)
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