30.This machine, ______for many years, is still working perf

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30.This machine, ______for many years, is still working perfectly.
A. after which I have looked B. which I have looked after
C. that I have looked after D. I have looked after
为什么A不对和B不一样吗

固定的动词短语look for：寻找（去掉for后look没有寻找的意思,所以介词for不能前置）
非固定的动词短语live in：居住（去掉in后live仍有居住的意思,所以介词in可以前置）
同理固定动词短语look after中after不能前置

30.This machine, ______for many years, is still working perf 30.This machine,______for many years,is still working perfec This machine,______for many years,is still working perfectly the machine-,( )for many years,is still walking perfectly if the machine is working this kind of machine was using many years ago 找出错误一项并改正 By the end of this year he ______for thirty years. This machine is unavailable. The machine ___(invent) many years ago. This camera _________(buy)many years ago,but it still works xiexieThough his faher ______for many years……A has retired B Her uncle worked as an ______for many years in the company.(