is known to us all is that the 2008 Olympic Games will take place in Beijing.
A. It
B. As
C. what
D. which
网友回答
A. It
B. As
(答案→)C. what
D. which
解析：句意:我们大家都知道的是2008年的奥运会将在北京举行。 is known to us all 是主语从句，它缺少主语，故用代词what来充当主语。这个句子的同义句为：（1） As is known to us all , that the 2008 Olympic Games will take place in Beijing.（2）_It is known to us all that the 2008 Olympic Games will take place in Beijing.故选C 。