is known to all is Diaoyu Island is part of China.A. What; thatB. It; thatC. As thatD.

问题补充：

is known to all is Diaoyu Island is part of China.

A. What; that

B. It; that

C. As, that

D. What; what

答案：

(答案→)A. What; that

B. It; that

C. As, that

D. What; what

解析：考查名词性从句。主语从句中缺少主语，故用what;表语从句中不缺少任何成分，故用that引导。