Thismachine,______form

发布时间：2020-07-11 22:49:43

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

网友回答

B解析which I have looked after 构成一个非限制性定语从句.
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