这个 in the past over xxx years说法 ok吗有上面的这种说法吗 这个over放这里是可有可无的 还是错误的呢

In study after study over the past the changes in Beijing over the past 100 over the past是什么意思 over the past centuries 这个 in the past over xxx years说法 ok吗有上面的这种说法吗 这个over放这里是可有可无的 还是错误的呢 为什么是in the past three years而不是over the past three years over the past twenty years 还是in the past twenty years in the past two years和over the past two years有什么区别? in the past 3 years 和 over the past 3 years的区别 over the past century意思 In the past the worst is over,let's meet the new He has been exposed___English in America over the past two yearsA withB in C intoD to in the last few decades和over the past few decades 意思一样吗? in the last few decades和over the past few decades 意思一样吗 为什么over the years用现在完成时 而it 's about changes in Beijing over the past century不用呢 in the past造句 Memory in the past in the past two