When they went into the park they saw someone Chinese Kongfu.A. playsB. playedC. to play

问题补充：

When they went into the park, they saw someone Chinese Kongfu.

A. plays

B. played

C. to play

D. playing

答案：

A. plays

B. played

C. to play

(答案→)D. playing

解析：考查感官动词see的用法。句意“当他们走进公园时，他们看到有人在打中国功夫。”，“看到某人正在做......”用see sb. doing sth.，“看到某人做了某事”用see sb. do sth.。根据句意，用playing，故选D。