They C_ in Guangzhou since 2000.A.lived B.had lived

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They ____C_____ in Guangzhou since 2000.A.lived B.had lived C.have lived D.were living
这个选C.但是是不是因为有SINCE所以才选C的呢?那么SINCE可以在过去完成式中出现吗?BY THE YEAR...和BEFOR是过去完成式的标志词,那这两者可以从现在完成时中出现吗?

答案选C是对的,你的理解也很对.
since可以在过去完成时中出现,但需有表明是用过去完成时的条件.如：
They said that she had lived in Guangzhou since 2000.在此从句中用过去完成是因为与they said 相比,lived在said 前.
by the year +过去年份、 before+过去年份（应出现在宾语从句中）与since.都是表示时间状语的方法,一般不会同时出现在一个句子中.

They ____C_____ in Guangzhou since 2000.A.lived B.had lived They _________ in Guangzhou since 2000. A. lived B. had live They （）in Guangzhou sine 2000 A.live B.had lived C.have live They had lived in Shenzhen ____ 2001.A for B .since,选什么 they .here since the factory opened.A:have lived B:had lived Since then,they ____in the village.A.have lived B.lived C.wi She _____ in Shanghai for ten years.A.has lived B.had lived They ____ here since they moved to New York in 1996.A.lived they lived in a flat__the shop She _____ in Shanghai for ten years since 1992.A.has lived B .Mr Green_______ in China since five years ago.A.lived B.has all their lives they had lived in a town.这个句子后半部分they had li