Question

No sooner__the station than the train left A we h

No sooner__the station than the train left
A we had reached B had we reached
C we reached D did we reach
为什么选B

Answer 1

原因是：No sooner……than是固定搭配,意为：
"一...就..."
引导时间状语从句,主句用过去完成时（had they reached）,"than"后面的从句用一般过去时（the train left）.(从这里可以知道,no sooner后面是主句;than后面是从句)
你可能是和hardly ...when给弄混了.他俩意思一样,可搭配是不同的、固定的.
因此,此句为部分倒装,意为：他们一到火车站火车就开走了!

Answer 2

首先要用倒装句势，其次到达在火车离开前发生