By the time we()the railway station,the train为什么不是 reached has left而是 reached had reached

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By the time we()the railway station,the train
为什么不是 reached has left
而是 reached had reached

是错了.
如果是赶火车,那么就是 has left ,火车已经开le
如果是接人,那么就是 has arrived,火车已经到了