___ is known to everybody,Taiwan is a part of China.We must

___ is known to everybody,Taiwan is a part of China.We must unify it.
A.It B.as
请问为什么?
为什么A不可以？

as is known to sb,意思是”某人知道.这个地方可以翻译成：每个人都知道..
it is known that是固定结构.意思和刚才的一样：每个人都知道..
其实选择it 的话 ,也可以 ,但是呢,要去掉那个逗号,或者说把逗号改成that,那么这样的话就是
it is known to everybody that Taiwan is a part of China.We must unify it.

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