are you going to be you grow up?A. What whileB. What when C. When how D. When what

问题补充：

are you going to be you grow up?

A. What, while

B. What, when

C. When, how

D. When, what

答案：

A. What, while

(答案→)B. What, when

C. When, how

D. When, what

解析：本题的含义是当你长的时候，你想干什么？When引导将来的时间状语从句，用一般现在时来表示，what是什么的含义，符合题意，故本题选B。