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

问题补充：

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

A. What

BIt

C. As

D. Which

答案：

(答案→)A. What

B. It

C. As

D. Which

解析：句意：众所周知， 年奥运会将在北京举行。It做形式主语。后面的that从句是真正的主语。

考点: 考查主语从句的关系词辨析。