is known to everybody Taiwan is a part of China. We must unify it.A. ItB. AsC. ThatD. Wh

问题补充：

is known to everybody, Taiwan is a part of China. We must unify it.

A. It

B. As

C. That

D. What

答案：

A. It

(答案→)B. As

C. That

D. What

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