But water,---is well known,can also exist as a gas or a soli

问题描述：

But water,___is well known,can also exist as a gas or a solid.
填定语引导词.我觉得该填as~不过想想which也可以吧?
1个回答 分类：英语 2014-10-10

问题解答：

我来补答
AS
as is well known,固定用法.
 
 
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