Friends are those make you smile always open their hearts to you and encourage you to suc

问题补充：

Friends are those make you smile, always open their hearts to you and encourage you to succeed.

A. which

B. what

C. whom

D. who

答案：

A. which

B. what

C. whom

(答案→)D. who

解析：考查关系代词。句意为：朋友就是那些让你微笑，总是向你敞开心扉并鼓励你成功的人。先行词those在这里指人，并且在从句中做主语，所以要用who。故选D。