The greens didn`t catch the train when they got to the station the train ______________A.left B.was left C.has left D.had left请说明理由

The greens didn`t catch the train when they got to the station the train ______________A.left B.was left C.has left D.had left请说明理由
The greens didn`t catch the train when they got to the station the train ______________
A.left B.was left C.has left D.had left
请说明理由

The greens didn`t catch the train when they got to the station the train ______________A.left B.was left C.has left D.had left请说明理由
D had left （过去完成时）
从句when they got to the station一般过去式,主句 the train had left 发生在从句之前,所以用过去完成时.

D.had left

这里表示在过去（到达车站）某时以前发生的动作（火车开走了）
表示过去的过去， 要用过去完成时【had+ 过去分词】

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