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How did you know him?we___on the train to guangzhou in 1999

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How did you know him?we___on the train to guangzhou in 1999 and we ___friends for ten years
How did you know him?
we _met 、 have met 还是 had met__ on the train to guangzhou in 1999 and we _have been 还是had been__friends for ten years.
要用什么时态啊?
How did you know him?we___on the train to guangzhou in 1999
How did you know him?
we met on the train to guangzhou in 1999 and we have been friends for ten years.
再问: 后面那个为什么不用过去完成时啊?
再答: for ten years可以看出,have been表示朋友关系持续到现在。