When I arrived the train station yesterday,The train had left.

问题描述:

When I arrived the train station yesterday,The train had left.
只有过去完成时态才有两个动作吧 或者是时间状语从句
怎么不是两个动作?~!

昨天当我到车站时,火车已经开走了.这里强调"过去"中"已经发生的事".用过去完成时