I have been doing community service work in Oakland for the past several years.
过去几年里我一直在奥克兰做社区服务工作。
In the past several years, many new stories about corporate greed have come to surface.
在过去的几年中，许多新企业贪婪的故事来表面。
I have written several books on learning English in the past six years.
在过去的六年里我已经写了几本有关学英语的书。
I have written several books on learning English in the past six years.
在过去的六年里我已经写了几本有关学英语的书。
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