Since they(visited/have visited)hangzhou two years

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Since they visited hangzhou two years ago,they want to live in that place.
======以下答案可供参考======
供参考答案1:
have visited
want绝对正确.
供参考答案2:
Since they visited hangzhou two years ago,they have wanted to live in that place.
这个答案应该是这样的，你把两句话对换看看就知道。
首先第一个肯定是用过去式的，你看见有ago就不用多想了。再想想时态就行了。
供参考答案3:
Since they visited hangzhou two years ago, they had been wanted to live in that place.
首先,第一个肯定是visited,因为有two years ago,所以肯定不能用完成时.其次,个人认为两个选项都不是特别好.因为是从两年以前,一直有这个想法,所以应该用过去完成时比较好.