Kate won her first gold medal at the age of 7 . A. when it was 7B. when she was 7C. at 7D.

问题补充：

Kate won her first gold medal at the age of 7 .

A. when it was 7

B. when she was 7

C. at 7

D. when I was 7

答案：

A. when it was 7

(答案→)B. when she was 7

C. at 7

D. when I was 7

解析：本题的含义是凯特在她7岁的时候赢得了金牌，when可以引导时间状语从句，本题的主语是Kate ，用she来代替看，故本题选B。