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in the last three years和in the past three years的区别

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in the last three years和in the past three years的区别
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in the last three years和in the past three years的区别
in the last three years可以是在指定的某一段时间里的最后三年或者是现在时间的前三年,可以是上世纪的最后三年：in the last three years of 20th century.或者06、07、08年.
而in the past three years只能是指现在时间的前三年,就是只有06、07、08这三年.
in the last three years和in the past three years的区别 in the last three years与in the past three years的区别,好像一个用过去式, In the past three years You___a lot in the past three years. in the past few years和in the last few years的区别, 为什么是in the past three years而不是over the past three years In the past three years there great changes in Beijing. Great changes _____ in Hainan in the past three years. Nanjing__(change)a lot in the past three years. in the past three years是用过去完成时还是现在完成时? In the past three years ,he ____the country twice. China_____(发展)quickly in the past three years.