_______is known to us all is that the 2008 Olympics will take place in Beijing.A It B What C As D Which 选什么,为什么,是第二个吗,原因是主语从句吗,还是请您讲一下吧

_______is known to us all is that the 2008 Olympics will take place in Beijing.A It B What C As D Which 选什么,为什么,是第二个吗,原因是主语从句吗,还是请您讲一下吧
_______is known to us all is that the 2008 Olympics will take place in Beijing.
A It B What C As D Which 选什么,为什么,是第二个吗,原因是主语从句吗,还是请您讲一下吧

_______is known to us all is that the 2008 Olympics will take place in Beijing.A It B What C As D Which 选什么,为什么,是第二个吗,原因是主语从句吗,还是请您讲一下吧
是,
As is known to all是一个固定的搭配,放在句首,正如我们所知道的那样.
而这里可以往后看如果是选C的话,后面就不会加‘is that’了.所以选‘What’,真正的主语就是‘the 2008 Olympics will take place in Beijing’,这是一个主语从句,用‘what’来代替真正的主语.

选B
就是what引导的主语从句

what

是选B。这句话是一个主语从句。很容易误选C。确实这种情况选C是比较多的，但是这道题如果选了C的话就没有主语了。并且as引导的非限定性定语从句谓语句首是要有逗号的，所以这个选B。

what is known to....主语从句

按四楼的说法 后面的is 就没有地方放了 所以选B

是选B，是主语从句。
What指代the 2008 Olympics will take place in Beijing
换为一般句就是The 2008 Olympics will take place in Beijing is known to us all.
英语中为了避免头重脚轻，所以用从句比较好~