问题补充：
is known to everybody, Taiwan is a part of China. We must unify it.
A. It
B. As
C. Which
D. What
答案：
A. It
(答案→)B. As
C. Which
D. What
解析：句意：众所周知，台湾是中国的一部分。我们必须统一它。as 在句中引导定语从句，做主语，意为“正如”，故选B
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