He wants to be a doctor when he .A. looks upB. grows upC. gets upD. comes up

问题补充：

He wants to be a doctor when he .

A. looks up

B. grows up

C. gets up

D. comes up

答案：

A. looks up

(答案→)B. grows up

C. gets up

D. comes up

解析：A.向上看，查找 B.长大C. 起床D. 发生，开始。句意：当他长大后，他想成为一名医生。故选B。