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_____ is known to all, paper was first made in China. 
A.ItB.ThatC.WhichD.As
D
由逗号可知,前面是一个非限制性定语从句,所以用As;Which引导定语从句不可置于句首;若把逗号改为that,则成为主语从句,答案则选A.
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