2. 外语
  3. All flights______because of the storm, they decided to take the train.

All flights______because of the storm, they decided to take the train.

admin2013-10-11  38
问题 All flights______because of the storm, they decided to take the train.
选项 A、having canceled
B、having been canceled
C、were canceled
D、have been canceled
答案B
解析
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