A1l flights _________ because of the hea

问题选择题

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

答案

题目分析：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。