We _(be) there many times during the past three years.填空并翻译

We _(be) there many times during the past three years.填空并翻译 During the past five years,there ＿＿＿（be）great changes in our during the three years,I___（make,made)many mistake In the past three years there great changes in Beijing. In the past three years It during the past five years 英语七选五（104）During the past one hundred years,there have been The song____(sing) many times by the students in the past we ____ so many profits have been made in the past three years in three years we may all be gone 翻译 英语翻译翻译一篇英语文章During the past fifteen years a great deal of at He has been there many times in the past .为什么句中有been.