But water,___is well known,can also exist as a gas or a soli
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?
填定语引导词.我觉得该填as~不过想想which也可以吧?
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你能帮帮他们吗
你能帮帮他们吗