― Did you go to the Shanghai World Expo?― Yes my father took me there. It was really

问题补充：

― Did you go to the Shanghai World Expo?

― Yes, my father took me there. It was really !

A. a great fun

B. a fun

C. great fun

D. a great funny

答案：

A. a great fun

B. a fun

(答案→)C. great fun

D. a great funny

解析：考查名词。Fun是不可数名词。只能说It is great fun.