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whatweallknow和asweallknow的区别,用法

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what we all know和as we all know的区别,用法
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what we all know,在这里属于what引导的名词性从句;As we all know属于as引导的非限制性定语从句;例如:What is we all know is that YaoMing used to be the best basketball player in China.As we all know,Yao...