After being brought up in the countryside for a decade, the daughter returned to the big city, ________ worked his parents.A.whichB./C.whereD.when
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C解析试题分析：这个句子中包含一个非限制性定语从句，关系词在定语从句中作地点状语，故用where。考点：定语从句关系词的考查
点评：解答这类题，首先要确定从句是什么从句，然后依据相应的语法规则做题。定语从句中关系词的确定，要看它在定语从句中作什么成分。