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.

admin2010-01-15  23
问题 All flights ______ because of the storm, they decided to take the train.
选项 A、having canceled
B、were canceled
C、having been canceled
D、have been canceled
答案C
解析 在现在分词的独立结构中名词或代词和现在分词在逻辑上是主谓关系，如：Silver is the best conductor，copper following behind．银是最好的导体，铜次之。
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