In the last few years they _____ ______more than 300 million trees.老师讲的答案是have planted 我不太明白 可以告诉我理由么

in the last few My life changed a lot in the last few year.这句话有错吗? 句型转换.Mike studied a lot last year.(用in the last few years改为句子） Mike _____ _____a lot inthe last few years. “There has been great changes in computers in the last few year”为什么是 has been不是have had in the last few years是什么时态 我的生活在最近几年里改变了许多 My life __ __a lot in the last few year. 1 on the last few day 还是in the last few day（s） 还是on the last few days in the last few years还是in the last few yearRT in the last few days为什么用last? The boys enjoyed______ in Beijing last year. in the past few years 过去完成时 in the last few years 现在完成时 in the past 一般过去时 for the last few years和 in the last few years的区别 There ____ great changes in such kind of computers in the last few year.Ais Bare Cwill be Dhave been答案是D,请问为什么不选C. 1.Great changes have taken place ____.a.in the few year b.in the few years c.last year d.on the last year2.Children wake up very early _____the morning of christmas day.a.in b.on c.for d.at3.________a cold winter morning,Imet her in the street.a.in b i'd had reson enough in the last few months.如何理解last?如何理解few? in the last year时态问题这与in the past few years 有什么区别?是不是in the last year是没有the的?可以用现在完成也可以用过去完成而in the past few years只能用现在完成?不清楚的话 请不要乱说 高三了 英 in the last few years 为什么要加 the in the last few years=over the years吗