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thismachine,formanyyears,isstillworkingperfectly.A、afterwhichIhavelookedB、whichIhavelookedafterC、thatIhavelookedafterD、Ihavelookedafter本题为什么不可以选择D,因为引导词which是lookafter的宾

题目详情
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 本题为什么不可以选择D,因为引导词which是look after的宾语时 可以省略
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答案和解析
答案B,已经省略了looked after后面的it了.which表示从句从属关系,此处不可省略,否则指代不清.