A friend is someone says “What! You too? I thought I was the only one!”A. whoB. whichC.

问题补充：

A friend is someone says, “What! You too? I thought I was the only one!”

A. who

B. which

C. what

D. whose

答案：

(答案→)A. who

B. which

C. what

D. whose

解析：本句中先行词someone为下文定语从句的逻辑主语，指人，故引导词用who，选A。