____is known to everybody,the moon travels round the earth

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____is known to everybody,the moon travels round the earth
答案为啥是which
不是what

As 引导的定语从句通常放在句首,意为众所周知的是.What 不能引导定语从句.
再问：咋看出来是定语从句的是不是如果我非要what引导的话,有what的这从句必须是名词作用??
再答：其实是这样的 The moon travels round the earth as is known to everybody.这样才是句子的正确的顺序，不过为了避免头重脚轻，所以把主句移动到后面，把as 引导的定语从句放在前面,as指代的是整个句子 The moon travels round the earth 。 What is known to everybody 是一个问句，什么为众人所周知呢？这里的本质原因是what 不能引导定语从句。

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