is known to us all is that the Olympic Games will take place in Beijing.A. ItB. Wha

问题补充：

is known to us all is that the Olympic Games will take place in Beijing.

A. It

B. What

C. As

D. Which

答案：

A. It

(答案→)B. What

C. As

D. Which

解析：what在此引导主语从句，且在主语从句中用作主语，相当于the thing that。句意为：众所周知，奥运会将在北京举行。