John a doctor when he upA. are; grow B. is going to be; growC. is going to be; growsD. i

问题补充：

John a doctor when he up

A. are; grow

B. is going to be; grow

C. is going to be; grows

D. is; grow

答案：

A. are; grow

B. is going to be; grow

(答案→)C. is going to be; grows

D. is; grow

解析：句意：John打算做一名医生当他长大之后。分析：时间状语从句体现主将从现，计划、打算用be going to. 从句中他是第三人称单数，因此，动词用单数。故选C