Question

() is known to us all is that the 2008 Olympic Games will take place in Beijing.我高一，

这么有这种题目啊。我选as，为什么不可以。是因为as不能引导主语从句？主语从句我都不太了解。我只觉得凭语感，as is known to us all 可以当主语
【【有人说这个不是主语，主语是： that the 2008 Olympic Games will take place in Beijing 。为什么啊。难道因为他是什么主语从句？但....is ....不会觉得前面的是主语吗

Answer 1

() is known to us all is that the 2008 Olympic Games will take place in Beijing.我高一，
虽然你的提问不完整，我也知道【空格里】需要填【what】。
因为what=the thing which/that.
需要主语+is known。 还是需要主语+is that...
所以What is known to us all主语
is that the 2008 Olympic Games will take place in Beijing.系表结构作谓语。

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