A1l flights because of the heavy storm, so we decided to take the train.
A. have canceled
B. have been canceled
C. had canceled
D. had been canceled
网友回答
A. have canceled
B. have been canceled
C. had canceled
(答案→)D. had been canceled
解析：考查时态语态：句意：由于暴风雨所有的航班都已经被取消了，所以我们决定乘坐火车。因为航班是被取消，用被动语态，排除AC，从so we decided to take the train.可知是在决定之前，航班就取消了，是过去的过去，用过去完成时，选D。