as is reported in the newspaper,talks between the two countries are making progress.

题目

as is reported in the newspaper,talks between the two countries are making progress.
这里as 的用法是什么?为什么可以这样用

答案

正如报纸上所报道的,这两个国家的会谈正取得进展.
这是as 引导的定语从句,as在句中作主语,指代后面整个句子.
在英语中,引导定语从句指物的有which,that等,Which,that引导定语从句放后面,只有as 可放在前面,指代后面的整个句子,翻译“正如...一样”