But water,___is well known,can also exist as a gas or a solid.

But water,___is well known,can also exist as a gas or a solid.

题目
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?
答案
AS
as is well known,固定用法.
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