Now he works in the factory his father used to work.A. whereB. whenC. in whichD. that

问题补充：

Now he works in the factory his father used to work.

A. where

B. when

C. in which

D. that

答案：

(答案→)A. where

B. when

C. in which

D. that

解析：考查定语从句。先行词in the factory为下文的逻辑地点状语，故引导词用where，选A。