问题
选择题
____ is known to us all is that the World Expo 2010 will take place in Shanghai.
A．It
B．What
C．As
D．Which
答案
答案：B
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____ is known to us all is that the World Expo 2010 will take place in Shanghai.
A．It
B．What
C．As
D．Which
答案：B
