excited us Chinese greatly that Liu Xiang，a Chinese，won the Olympic champion of the 110 meter hurdle race
A. What
B. That
C. It
D. As
网友回答
A. What
B. That
(答案→)C. It
D. As
解析：本题如选A项，其句型应为：What excited us Chinese greatly was that...。如选D项，应改为：As excited us Chinese greatly，Liu Xiang，...。B项中的that只能引导主语从句，不在句中作任何成分。如选B项，句中则缺少主语。本题中It为形主语,that引导的从句为真正的主语。