问题补充：
.
If I long enough to have a job, I would choose to be a doctor, those AIDS
patients.
A. had lived; helping
B. should live; help
C. were to live; helping
D. should have lived; help
答案：
A. had lived; helping
B. should live; help
(答案→)C. were to live; helping
D. should have lived; help
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