1、All fights___off beacuse of the terrible weather,so they had to go there by train.

题目

1、All fights___off beacuse of the terrible weather,so they had to go there by train.
A was called Bcalled C had called Dhad been called
给我准确答案 我语法基础不好

答案

D
因为恶劣的天气,所有的航班都被取消.所以他们必须坐火车去那里.
用过去完成时,此动作发生在坐火车去那里（过去时）之前