I have a friend is training for the Olympics　A. whoB. whose　　　C. what　　　D. where

问题补充：

I have a friend is training for the Olympics．

A. who

B. whose

C. what

D. where

答案：

(答案→)A. who

B. whose

C. what

D. where

解析：本题考查的是定语从句，选择关系代词，根据先行词为人，同时在从句中做主语，故选A