she had been working in this factory ( ) A in 1980 B after 1

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she had been working in this factory ( ) A in 1980 B after 1980 C since 1980 D until 1980
since 1980表示的是从1980开始到now ,until 1980表示 1980以前某时点到1980 距now还有一段时间所以根据过去完成时概念我选D 却是C 求神马

首先,由于没有具体语境,since 1980可以是表述从1980开始到now ,也可能表述从1980开始到过去某一时间.但和since的用法都不矛盾.
until 的主句是延续动词,只表示动作延续到此点就完成了.
和完成时的区别是：完成时更强调这一延续动作对说话当时的影响,并且动作也不一定结束.而until只强调动作本身延续.
用untill时,意义：她在这个公司干到1980年就不干了（worked）.
用since时,意义：她从1980年就来这个公司了（强调她是个老员工了,该考虑提提职位了.）（had or has been working ）.

做出下列各题(1)She ___ in a big factory.A.work B.works C.working D she puts this love to a good use by working in the after-sch Connie has been working in the factory __ she was twenty yea I have been working in this factory for about 20 years and s My mother has been working in that clothing factory for___. Mary works at a factory . She starts working at eight in the （）three years,she had a baby.A.In B.After C.On Who () in a car factory?A.work B.works C.working 状语从句Mary --------- （begin） to work in a factory after she--- A big factory has been built in this area _____ such goods f A big factory has been set up in this area _____ such goods The production in this factory had increased faster than ___