摘要： 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 解析 分析题干结构“ is known to us all 是主语从句.从句中缺少主语.what引导主语从句.在从句中作主语.如果选it.需去掉all后的is;如果选as;需去掉is that.

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