一个英语问题：原句：I didn't work for twenty years ,为什么不是I haven't worked for twenty years?twenty
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一个英语问题：原句：I didn't work for twenty years ,为什么不是I haven't worked for twenty years?
twenty
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一个英语问题：原句：I didn't work for twenty years ,为什么不是I haven't worked for twenty years?twenty