— What are you going to___ when you ___ up?

试题详情及答案解析: — What are you going to___ when you ___ up?
—I am going to be a scientist.
A. do, grew B. does, grow C. be, grow; 答案：C; 试题分析：句意：――当你长大后你想干什么？――我打算成为科学家。when为当……时，主句用一般将来时，从句用一般现在时。结合句意，故选C。
考点：考查一般现在时的用法。