问题补充：
Jim who is now our English teacher once as a manager in an international cooperation for 5 years.
A. has worked
B. had worked
C. was working
D. worked
答案：
A. has worked
B. had worked
C. was working
(答案→)D. worked
解析：考查时态。本题抓住关键词once曾经，故用一般过去时，陈述过去的事实。句意：吉姆，曾经在一家国际公司担当5年经理，现在是我们英语老师。故D正确。
