I served as monitor for one year.
我当过一年的班长。
I served as the monitor for two years.
我曾做过两年班长。
Yes, I served as the monitor for two years.
有，我曾做过两年班长。
I served as the Class President for two years.
我曾当了两年班长。
This is not only the past, I served as a post.
这是我以前唯一没有担任过的职务。
Yes, I served as a research assistant to my supervisor.
我为我的导师当研究助理。
I served as the sales manager for our company in the last two years.
在过去的两年里，我在公司担任销售经理。
I served as a interpreter and volunteer at many business and culture activities.
我曾多次在大型商务和文化活动中担当口译员和志愿者。
Since I served as the production manager, I reduced the production cost by 20 percent. , 20%
自从我任生产经理以来，把生产成本降低了20%。
At different times, I also served as an M. C.
有的时候，我还担任过主持人、翻译和歌手。
For the past three years, I have served as a private secretary to Mr.
在过去三年，本人一直担任唐先生的秘书。
For the past three years, I have served as a private secretary to Mr.
在过去三年，本人一直担任唐先生的秘书。
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