_______ is known to us all that the 2010 World Expo took place in Shanghai.A．ItB
题型：不详难度：来源：
| _______ is known to us all that the 2010 World Expo took place in Shanghai. |
答案
| 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。 |
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