----is well known to us all that Taiwan belongs to China.--- is known to us all ,Taiwan is part of--is known to us all that Taiwan is part of china---is known to us all is that Taiwan is part of chinaA.it B.As C.That D.what四题应选什么,为什

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----is well known to us all that Taiwan belongs to China.--- is known to us all ,Taiwan is part of--is known to us all that Taiwan is part of china---is known to us all is that Taiwan is part of chinaA.it B.As C.That D.what四题应选什么,为什
----is well known to us all that Taiwan belongs to China.--- is known to us all ,Taiwan is part of
--is known to us all that Taiwan is part of china
---is known to us all is that Taiwan is part of china
A.it B.As C.That D.what
四题应选什么,为什么?
关键是为什么

----is well known to us all that Taiwan belongs to China.--- is known to us all ,Taiwan is part of--is known to us all that Taiwan is part of china---is known to us all is that Taiwan is part of chinaA.it B.As C.That D.what四题应选什么,为什
第一题填It.
that Taiwan is part of china是真正的主语.这句本来是：
That Taiwan is part of china is known to us all.
由于主语太长,于是移到句尾,而原先主语的位置空出来了,就用形式主语it来补上去.句子就变成：
It is known to us all that Taiwan is part of china.
第二题填What.
这是一个“主+系+表”结构的句子：What is known to us all是主语；is是系动词；that Taiwan is part of china是表语.
主语中心词是what,what相当于the thing that.
the thing that is known to us all中,that is known to us all是定语从句,修饰the thing.把它浓缩成What is known to us all后就不能再说is known to us all是定语从句了,只能说它是一个名词性短语.

第一个选A，It做形式主语
第二个选D what is known to us all 是整个句子的主语，而what 是is known to us all 的主语。

It is well-known it is well known to us that是什么意思 As is well known,machines need to lubricate. it is well known that is well known for ,is thought of ,is pround of ,is said to have的意思 Beijing is well ()its beautiful scenery amd the great wallA KNOWN AS B KNOWN TO C KNOWN ABOUT D KNOWN FOR It is well-known to sb 还是It is well-known to for sb?为某人所熟知的,应该用哪个戒指? France is well-known __people all over the worldFrance is well-known __ people all over the world __its fine wineA.to asB.to for为什么选B t is well known that smoking is harmful to the health __is well known to all,the earth is round填as or it or that Mr Lee who is well known to the chinese麻烦翻译这句, 翻译句子：It is safe to choose only well-known pieces when giving a performance. The fact that she worker hard is well known to us all .英译汉首字母填空 It is well known that social c________ are quite different from country to country. Beijing is well-known _______ the capital of China while Hangzhou is well-known 请解析Beijing is well-known _______ the capital of China while Hangzhou is well-known _______ the West Lake.A.for; as B.as; for C.for; to D.as; to it is well-known that,还是it is well known that到底是哪一个?well known和 well-known有什么区别？ Well known Tomas Edison is well-known ___inventions____a great inventor A to;as B for;as C as;to D to;for