问题补充：
---- Are you still a teacher?
---- No, I in Harbin No. 3 High School for five years.
A. worked
B. have worked
C. have been working
D. had worked
答案：
(答案→)A. worked
B. have worked
C. have been working
D. had worked
解析：根据回答“我现在不是老师了，我在哈尔滨三中工作了五年”只是描述过去的动作（工作了五年）和现在没关系，所以用一般过去时态选A
