over the past twenty years 还是in the past twenty years

over the past twenty years 还是in the past twenty years with ()reform over the past twenty years为什么括号里填economic呢? over the past是什么意思 over the past centuries in this area.over-----of the trees have been damaged in twenty the past twenty yearsA two thirds B 60 percents C 60 th percent 选什么 over the past century意思 In the past twenty years,Lau has made over one hundred films.句中 In the past twenty years 是一个时间段.所以用了现在完成时has made .那么是不是只要句中有一个时间段出现就用现在完成时? LOOKING BACK OVER THE PAST是什么意思 over the past ten years是什么意思 over the past year.这儿的 over the past centuries汉语意思 In study after study over the past Several times over the past decades China has changed a lot in the past twenty years the,nature,programme,begins,eight ,past ,twenty 连词成句 over the past ten 为什么over可以用在这里? twenty-five past The past twenty years witnessed the fast development of the internet along with national economy.这句话The past twenty years witnessed the fast development怎么理解?