All flights _________ because of the storm, they decided to take the train. ( 章节：3 难度：3)
- A、having canceled
- B、having been canceled
- C、were canceled
- D、have been canceled
正确答案:B
答案解析:有
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All flights _________ because of the storm, they decided to take the train. ( 章节：3 难度：3)
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