问题补充：
--- Why do you want to be a lawyer?
--- If l become a lawyer, I help people.
A. will can
B. am able to
C. will be able to
D. was able to
答案：
A. will can
B. am able to
(答案→)C. will be able to
D. was able to
解析：句意：--为什么你想成为律师？--如果我成为一名律师，我将会帮助人们。分析答语是if引导的条件状语从句，体现主将从现的原则。主句中体现将来时的只有第三项，故选 C
