In the past twenty years,Lau has made over one hundred films

In the past twenty years,Lau has made over one hundred films 1.over the past one hundred years.over换成in有什么区别?past换成last有什 over the past twenty years 还是in the past twenty years He has made a great_____ in the past five years. Only in the past hundred years when electric lightening was they --all over the country in the past ten years in the past few years和over the past few years有什么区别? 为什么是in the past three years而不是over the past three years in the past 3 years 和 over the past 3 years的区别 with ()reform over the past twenty years为什么括号里填economic呢? over the past ten years 这个 in the past over xxx years说法 ok吗