![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
[主观题]
All flights ______ because of the snowstorm, they decided to take the train.A.were cancell
All flights ______ because of the snowstorm, they decided to take the train.
A.were cancelled
B.have been cancelled
C.had been cancelled
D.having been cancelled
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)