_____ is known to all, paper was first made in China. A．ItB．ThatC．WhichD．As
题型：不详难度：来源：
| _____ is known to all, paper was first made in China. |
答案
| D |
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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