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。