7．He worked in a car factory for four years，______ he founded his own company in his hometown．（　　）
A．after whichB．after whenC．after thatD．after it

分析 他再一家汽車工廠工作了四年，之后他在家鄉(xiāng)建立了自己的公司．

解答 答案A．分析句子結(jié)構(gòu)可知，逗號之前是主句，逗號之后是非限制性定語從句，從句中主語為he，謂語動詞為found，賓語為his own company，從句中不缺少主、賓、表等主要成分應(yīng)該用關(guān)系副詞，關(guān)系副詞可理解為介詞+關(guān)系代詞whom（先行詞指人時）/which（先行詞指物時），主句與從句存在動作先后的時間關(guān)系，因此用介詞用after，因此從句中為after which，which指代前面整個主語的內(nèi)容，故選A．

點評 本題考查非限制性定語從句．解答此類題目首先要分析句子結(jié)構(gòu)，非限制性定語從句中逗號是一個明顯的標志，然后分析非限制性定語從句中的成分，如果缺成分用關(guān)系代詞，如果不缺成分用關(guān)系副詞．

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