The Blacks---many places of interest since they came to chin

问题描述:

The Blacks___many places of interest since they came to china.A will visit B.visited C.visit
D.have visited 选哪个?说下为什么
1个回答 分类:英语 2014-11-10

问题解答:

我来补答
D since用在现在完成时当中
再问: since 用在现在完成时中 为什么选D 过去式的
再答: since后面的从句才是一般现在时 前面用现在完成时
 
 
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