问题补充：
I graduated from college twenty years ago and I as an English teacher in this middle school ever since.
A. worked
B. have been working
C. had worked
D. was working
答案：
A. worked
(答案→)B. have been working
C. had worked
D. was working
解析：考查时态：句意：前我从大学毕业，自从那时起，我就在这个中学做英语老师。可知做英语老师是自从我从大学毕业到现在，用现在完成进行时。选B。
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