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