–Do you still remember the city we visited last year ?
--You mean Zhengzhou? I know there is a factory your mother worked.
A. that, which
B. where, that
C. which, where
D. where, where
网友回答
A. that, which
B. where, that
(答案→)C. which, where
D. where, where
解析：句意：你还记得我们去年参观过的那个城市吗？你的意思是郑州？我知道你妈妈在那里的一个工厂工作过。第一空中which 引导定语从句在句中作为宾语，第二空定语从句中不缺主语和宾语，用where作为地点状语，故选C