---What do you want to be when you ?---I want to be a pilot.A. open upB. pick upC. eat upD

问题补充：

---What do you want to be when you ?

---I want to be a pilot.

A. open up

B. pick up

C. eat up

D. grow up

答案：

A. open up

B. pick up

C. eat up

(答案→)D. grow up

解析：grow up意为:长大。整句理解：你长大了想当什么？我想当一名飞行员。从意思可知选D。