问题补充：
is known to us all that the Olympic Games will take place in London．
A. It
B. Which
C. As
D. What
答案：
(答案→)A. It
B. Which
C. As
D. What
解析：考查主语从句。句中it作形式主语，真正的主语为that the Olympic Games will take place in London。
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