___ is known to all,Columbus used a ship to discover America

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___ is known to all,Columbus used a ship to discover America about 450 years ago.
为什么填It而不填As?两者有什么区别?

it is known to all 众所周知
as we all know 正如我们所知道的那样
再问： It is known to all 后面不是应该接从句吗
再答： As is known to all属于放句首的定语从句，也可理解为状语
It is known to all后接从句that
As is known to all,the earth travels around the sun.
It is known to all （of us） that all matter is made up of molecules and that molecules are always moving.

这样看来，这里应该填As。

___ is known to all,Columbus used a ship to discover America 3.___ is known to us all is that America is a developed coun What is known to us all is that America is a developed count __is known to us all is that America is a developed country_ __ discovered america is well known to us all. As is known to all,___ there is pollution ,there is harm.A.w 1.___ is known to us all is that China is a developing count As is known to all ,和Which is known to all,China is a social Who first ___ America?---It is Columbus AS IS KNOWN TO ALL ____ is known to all,china is a developing country. ________ is known to all,Mary is a nice girl.