My Mum has worked in this school for over 20 years.My Mum has been working in this school for..有什么区别?

My Mum has worked in this school for over 20 years.My Mum has been working in this school for..有什么区别? My mother has worked in this factory 2 years.My mother has worked in this factory _____ 2 years.(A)about (B)for (C)in (D)since my mother ( )in that factory at the age of 18. A.had worked B.has worked C. worked D. works请说明原因. My aunt has worked as a secretary____2000.A.in B.since C.on D.for My uncle has worked in Beijing for more than twenty years.同义句：My uncle___to work in Beijing__twenty years___. have been doing 的用法,My borhter has worked in that factory since two years ago 问：不是have been doing吗,为什么会是has worked,余很笨, My father ___(work) in the factory since three years ago.A has worked B has begun to work为什么 My mother has worked in the shop since it ____A opensB has openedC opened并说明理由 my father-------in the factory for thirty years,and now he is at homeworked 可不可以用has worked My father worked in factory ( ) 1998. My uncle _____in Beijing for over 10yearS.now he lives in his hometown in Fuzhou.A、has worked B、wMy uncle _____in Beijing for over 10yearS.now he lives in his hometown in Fuzhou.A、has worked B、worked C、had worked D、worksfor+一段时间 -How long has his father worked in that city?-he has worked there s___ last year. It has worked well in controlling China's population.中的 has worked well 是不是语法点, My father ___(work) in the factory since three years ago.答案是has worked,我填has been working,可不可以呢?为什么 ___ then,my mom has worked as a teacher. my uncle ____in a high school in beijing,but recently he has studied in ausralia.a was working b is working c works d had worked Tom has worked in a office for about five years. 修改病句:He has worked in Benijing last year.