）—is the boy?—He is my brother.A What B Who C This

问题补充：

）—is the boy?

—He is my brother.

A、What B、Who C、This

答案：

解析：What什么；Who谁；This这个；根据下文，他是我的兄弟。可知上文问的这个男孩是谁？故选B。