2. 公务员
  3. All flights____because of the terrible weather, they had to go there by train.

All flights____because of the terrible weather, they had to go there by train.

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问题 All flights____because of the terrible weather, they had to go there by train.
选项 A、having been canceled
B、had been canceled
C、having canceled
D、were canceled
答案A
解析 本题考查的是独立主格，独立主格中分词与其逻辑主语间是动宾关系，表示完成，应该用非谓语动词的完成被动形式，即A。
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