is known to all Taiwan is a part of China.A. AsB. WhichC. ThatD. What

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：从逗号看出此处为非限制性定语从句，意思“正如，正像”。