Lisa has been playing the violin for two years 改为否定句

lisa's mother has been ill for two years.这个句子中为什么有been? there,Lisa,speak,before,can,been,because,has,she,French 陈述句 连词成句 Lisa has been playing the violin for two years 改为否定句 has been I first met Lisa three years ago.She____at aradio shpo at that time.A.has worked.B.had worked.C.was working.D.had been working. Lisa has two daughters,Lucy and Liiy.Lucy is Lily's____.Lisa is their_____. Lisa is ,tall and has long hair,.划线部分提问 has always has always been I first met Lisa three years ago.She _____ at a radio shop at the time.A.has worked B.was workingC.had been working D.had worked哪个正确,请分析一下为什么? 92. I first met Lisa three years ago. She _____ at a radio shop at that time.A. has worked B. was working C. had been working D. had worked I first met Lisa three years ago.She ________ at a radio factory at the time.A.has worked B.was working C.had been working D.had worked I first met Lisa three years ago.She _____ at a radio shop at that time.A.has worked B.was working C.had been working D.had worked这题我选C,我觉得work动作发生在met之前,一直持续.意思为在我遇见Lisa之前,她一直在收音机 has been anything taken. Where has she been? has been replaced How has China been? Has been very quiet Everything has been achanged