Unluckily,the train( ) when we got to the station (leave)

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Unluckily,the train( ) when we got to the station (leave)

Unluckily,the train( ) when we got to the station (leave)
Unluckily,the train( ) when we got to the station (leave)

Unluckily,the train( ) when we got to the station (leave)
had left
已经开了,在我们(过去时间)到达车站前,火车已经离开,所以是过去的过去,用过去完成时

had left

had left 从句中的时间已经是过去时,那主句要用过去完成时才可以
不幸的是,当我们到火车站的时候,火车已经开走了