Question

The train ________ the station when we arrived.

A. would leave
B. left
C. had left
D. will leave

Answer 1

答案C
这是一个过去完成时态的考题。
在包含 when，as soon as，before，after，until，now that等连词的从句中，如果主句谓语和从句谓语表示的过去动作是在不同时间发生的，那么先发生的动作通常需用过去完成时表示。例如：
When I woke up it had already stopped raining.
我醒来时雨已经停了。
I hadn't had any English before I come here.
我来这里之前没学过英语。