This machine, ______for many years, is still working perfectly.

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问题 This machine, ______for many years, is still working perfectly.

选项 A、after which I have looked
B、which I have looked after
C、that I have looked after
D、I have looked after

答案B

解析定语从句题。look after“照顾”，先行词为machine，在从句中作宾语，连接词及介词不能省略，又因为look after为固定词组，分开后会失去原本意思，所以不能将介词after提前。因此选择B。

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专业英语四级

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