is known to us a11 is that London will host the 30th Olympic Games nextA. AsB. WhichC. ItD

问题补充：

is known to us a11 is that London will host the 30th Olympic Games next

A. As

B. Which

C. It

D. What

答案：

A. As

B. Which

C. It

(答案→)D. What

解析：考查名词性从句。what =the thing that引导主语从句，注意与it 和as 的句型区别