问题补充：
is known to all, Taiwan is a part of China.
A. As
B. Which
C. That
D. What
答案：
(答案→)A. As
B. Which
C. That
D. What
解析：考查定语从句。As指代一句话内容，引导非限制性定语从句，位置很灵活，可以放在句首，句中，句末。Which引导的非限制性定语从句不能放在句首。That,what不能引导非限制性定语从句。故A正确。
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