问题描述： As is known to us.和It is known to us.后面接什么啊?为啥 1个回答 分类：英语 2014-12-03 问题解答： 我来补答 As is known to us是AS引导的非限制性定语从句,后面加句子以","隔开.It is known to us IT是形式主语,后加"that+句子" 展开全文阅读
