题目内容
By the time they arrived at the station, the train .
| A．will leave | B．would leave |
| C．has left | D．had left |
D
解析试题分析：句意：到他们到达火车站是，火车已经离开了。根据By the time they arrived at the station,可知到达这个动作发生在过去，火车离开是在他们到达之前，故用过去完成时。故选D。
考点：考查时态的用法。
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