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?

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?

AS
as is well known,固定用法.