Yao Ming is a famous basketball star is playing in the NBA .A. which B. who C. when D. whe

问题补充：

Yao Ming is a famous basketball star is playing in the NBA .

A. which B. who C. when D. where

答案：

解析：句意：姚明是一个在NBA打球的著名篮球明星。定语从句中，引导词常根据先行词而定。Who指人，which指物，when指时间，where指地点。根据句意，先行词是人，故应选B。