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
人气：281 ℃ 时间：2019-11-16 14:19:53
解答
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
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