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  3. All flights______because of the snowstorm, we decided to take the train.

All flights______because of the snowstorm, we decided to take the train.

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问题 All flights______because of the snowstorm, we decided to take the train.
选项 A、were canceled
B、had been canceled
C、having canceled
D、having been canceled
答案D
解析 。逗号后的句子结构完整,所以逗号前应是独立主格结构，动词应用非谓语的某种形式。动词cancel和flights是动宾关系，故要用被动语态。而且“航班取消”发生在“决定乘火车”之前，所以空处应用现在分词的完成被动式having been canceled。故选D。
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