_______ is known to us all that the 2010...

_______ is known to us all that the 2010 World Expo took place in Shanghai.

A．It

B．As

C．Which

D．What

A 【解析】考查it作为形式主语。真正的主语从句是后面的that the 2010 World Expo took place in Shanghai。

考点分析：

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