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。
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