five minutes before the last bus left,we arrived at the station

题目

five minutes before the last bus left,we arrived at the station
A.There were;to go B.With;to go C.It was;left D.It had;left

答案

A.There were;to go
There is/are/was/were some time to do sth.before ..."...还剩下多少时间了"
we前面似乎差个when.