on real ice is very exciting.A. Skate B. SkatesC. Skated D. Skating

问题补充：

on real ice is very exciting.

A. Skate

B. Skates

C. Skated

D. Skating

答案：

A. Skate

B. Skates

C. Skated

(答案→)D. Skating

解析：动词短语作主语一般要动名词形式或者动词不定式，只有D答案合适。意思是在真正的冰面上滑冰很兴奋。