it has been 2 years___my sister studied in this school

it has been since.用法 It has been in my it is/has been= It's has been accepted it has long been assumed It has been rained for 2 days.是不是对的? it has been 2 years___my sister studied in this school it's always been you(It has always been it has been可以缩写成it's been it's been.的全称是不是 it has been... It has been raining these days. It has been e()hot this week. it has long been known that it has since been rebuilt怎么翻译 英语句型转换题~1.He has been a League member for three years.It_ three years_ he _a League member.2.This bridge is 50 meters lo9ng and that bridge is150 meters long.That bridge is three_ _ _this one.3.My father didn'tsmoke any longer.My father Which is correct.Please explain it.1)How long has it been since this company was established?2)How long has the company been established? 造句it has been +时间段+since从句it has been +时间段+since从句 it has been used和it has been in use有什么区别吗