It has been a long time after _I saw you last time.不过我总

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It has been a long time __ after ___I saw you last time.不过我总觉得since用上去也不错吧?
用after错么?如果我自己做,我大多只会选since.

选since是“自.以来”,明确地表示了起始于过去的一个时间点到现在为止的一个时间段,和has been这样的现在完成时的动词形式呼应；而after是“在...时间之后”,没有更精确地表达出“到现在为止”的意思.
再问：如果用after造这个句子，句子怎么表达？
再答： After I saw you last time, it has been a long time so far/by now/up to now/up till now. 就是说给它这个时间定下一个明确的终结点。

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