as it is reported （接 that 从句, it 是形式主语。as 多余删掉）

as is reported（传统语法的定语从句，现代语法的比较从句）

As is reported, China has become an important country in the world.
正如报道的，中国已成为世界上一个重要国家。
As is reported in the newspapers, talks between the two countries are making progress.
正如在报纸上所报道的，两国间的谈判有所进展。
As is reported, a new library will be built here.
据报导，这里将建造一座新的图书馆。