________is known to us all is that the 2...

________is known to us all is that the 2012 Olympic Games will take place in London.

A．It	B．What
C．As	D．Which

B 【解析】这题考查what引导名词性从句的用法，这里what引导主语从句，并在主语从句中做主语，句意是：众所周知的是：2012年奥运会将在伦敦举行。选B。

考点分析：

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