All flights because of the snowstorm we decided to take the train. A. were canceled　B. ha

问题补充：

All flights because of the snowstorm, we decided to take the train.

A. were canceled

B. had been canceled

C. having canceled

D. having been canceled

答案：

A. were canceled

B. had been canceled

C. having canceled

(答案→)D. having been canceled

解析：考查非谓语动词。本句中没有连词，所以前半部分不是句子，而是一个短语，是一个独立主格结构。Flights与cancel构成被动关系，且是已经完成的动作，所以使用完成被动式。句意：因为暴风雪，所有的航班都被取消，我们绝对坐火车。