分析一道英语复合句_____is known to us all is that the 2008 Olympic Games will take place in BeijingA,ItB,WhatC.AsD,Which请问这是什么类型的句子啊?为什么要选那个呢?

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分析一道英语复合句_____isknowntousallisthatthe2008OlympicGameswilltakeplaceinBeijingA,ItB,WhatC.AsD,Which请问这是

分析一道英语复合句_____is known to us all is that the 2008 Olympic Games will take place in BeijingA,ItB,WhatC.AsD,Which请问这是什么类型的句子啊?为什么要选那个呢?
分析一道英语复合句
_____is known to us all is that the 2008 Olympic Games will take place in Beijing
A,It
B,What
C.As
D,Which
请问这是什么类型的句子啊?为什么要选那个呢?

分析一道英语复合句_____is known to us all is that the 2008 Olympic Games will take place in BeijingA,ItB,WhatC.AsD,Which请问这是什么类型的句子啊?为什么要选那个呢?
b
罗列用法
1 As is known to us,the 2008 Olympic Games will take place in Beijing
2 what is known to us all is that the 2008 Olympic Games will take place in Beijing
3 it is known to us all that the 2008 Olympic Games will take place in Beijing
4 不能用which,which只能用来作为定语从句连接词
具体原因,靠平时体会积累吧

B,What

B
what领导从句做主语,即整个句子的主语是what is known to us all。as领导状语从句,从句省略后不影响句子成分,这里如果用了as,句子就没有主语了,而且as的从句后面一般会用逗号隔开,另起一句。

what 引导作主语