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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

题目详情
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
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答案和解析
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.