during the past 3 years=in the last 3 years（现在完成时） in the past、last 15 years1.during the past 3 years=in the last 3 years（现在完成时）2.in the past、last 15 years我需要上面两个知识点的解析（区别）、例句,

during the past与in the past的区别 during the past quarter-cenrury什么意思? (1/3)During the past year,the number of traffic accidents in that city( during the past 50 years用于什么时态 What _____you _____(do) during the past two years? During the past century需要涉及的时态是什么啊? During the past two years与in the past two years区别 during the past 20 years 和 over the past 20 years一样吗? during the past 3 years=in the last 3 years（现在完成时） in the past、last 15 years1.during the past 3 years=in the last 3 years（现在完成时）2.in the past、last 15 years我需要上面两个知识点的解析（区别）、例句, in the last two years/during the last two years/in the past two years/during the past two years有什么区别? My life has changed a lot during the _____ years.A past a few B past few C a few past D few past Great changes have taken place in our hometown during the past ten years.中文意思是什么. great changes ___(take)place during the past few years in our town无 We _(be) there many times during the past three years.填空并翻译 During the past week,I have spent more than eleven hours on my homework.(mo It during the past five years用change a lot 什么时态 是一般过去时还是现在完成时 During the past five years,there ＿＿＿（be）great changes in our village. sightings of hummingbirds have become much more frequent during the past few years的翻译