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

over the years同义词 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 years ago和over the years用什么时态 over the years the cave wall had been shaped by 为什么用过去完成时 Cheng Long _(make) some great movies over the years用has made 的原因是因为后面的over the years吗?那么over the years又为什么用完成时呢?是因为它表示“一段时间”?囧了 The Smiths have been here for over ten years 为什么用“been here” over the years 等于什么? over the past few years 用什么时态 over the following years 应该用什么时态? over the years ,through the years 为什么加the?什么意思?如果不加the什么意思 请问over the years 和for the years 有什么区别么?The law threatens gains that blacks and other minorities have made over the years.为什么不能用for the years over the past ten years英语,over past ten years 出现,用什么时态.为什么用现在完成时,不能用过去完成时啊?请把现在完成时时间状语有哪些告诉我一下.我分不清楚了 in the last few years=over the years吗 over the years与during the years区别 over the years和through the years有什么区别 What do you think will be the really big growth areas of the economy over the next fifteen years?这里为什么用what提问,而不是where? three years after his flight over the North Polehis flight是名词啊,为什么后面可以跟介词over? over the years 的词性是什么