问题补充：
is known to us all is that the Olympic Games will take place in London.
A. As
B. What
C. That
D. It
答案：
A. As
(答案→)B. What
C. That
D. It
解析：考查名词性从句。句中what引导主语从句，在从句中作主语，故选B。
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