They tired to find out( ) the new train ( ) A how far/how go

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They tired to find out( ) the new train ( ) A how far/how gone B how long/has gone C how far/went
D how far had /run

应该是how far the new train had gone.
这里 go far是跑远了的意思.
楼主粗心了,不是tired,应该是tried to .表示尝试过,但没有成功,也就是没有弄清楚火车到底开了多远了.
用how long 的话,一般表示时间,后面用had left,表示离开了多久,不用go.
完成时态比较好理解,他们去查找车子走了多久,时间一直截止到他们找的那个时候.因为是过去(tried to)发生的事情了,故用过去完成时态.

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