问题
选择题
_________ is known to us all is that the 2008 Olympic Games will take place in Beijing.
A．It
B．What
C．As
D．Which
答案
B
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，2008年奥运会将在北京举行。
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