第2个回答 2018-11-18
当先行词为前面的整个句子时,非限制性定语从句的关系代词用as。as引导的非限制性定语从句可以置句首、句中、句尾。如: China is famous for the Great Wall, as is well known. As we all know , China is famous for the Great Wall. China, as we all know , is famous for the Great Wall. 当先行词为same、such或者先行词被这两个词修饰时,后面的定语从句用as.如: This knife is the same (knife) as I saw that day. I've never heard such (stories) as he tells.本回答被网友采纳