has been working 这叫什么时态来着,现在完成时加上进行时

has been worked和has been working的区别 She has been working for 20 hours has been working on his degree是什么意思 He has been working here.为什么要用working? has been working 和was working有什么区别 哪个对have she been working fou 1hour?/has she been working fou 1hour做否定回答呢 he()in the laboratory the whole morning.A.has been working ,B.is working,c.has worked John has been working on the essay whole afternoon and he still( Ahas been B does C has DisJohn has been working on the essay whole afternoon and he still( Ahas been B does C has Dis Mr.Smith is the only one of these foreiners who____in china.works 还是is working还是has been working 对画线部分提问 she has been working for 2 hours for 2 hours 画线 She has been working for 20 huors.(改为一般疑问句） Susan has been working in this city for 20 years 改为一般疑问句 has been working 这叫什么时态来着,现在完成时加上进行时 He has been working there for three years是啥意思?好的我天天顶 the writer has been used to sl( )in the daytime and working at night she has been working in our company since 2012.6这句话有没有语法错误? My sister has been working ()western China since graduated.A:at B:in C:on D How long has Greg been working on his degree--- five years?请翻译