is known to all, paper was first made in China.A. ItB. ThatC. WhichD. As

发布时间：2020-08-14 23:46:55

     is known to all, paper was first made in China. 
A. It
B. That
C. Which
D. As

网友回答

A. It
B. That
C. Which
(答案→)D. As
解析：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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