It was in the factory his friend worked he picked up a lot of experience.
A. where, where
B. that, where
C. that, that
D. where, that
网友回答
A. where, where
B. that, where
C. that, that
(答案→)D. where, that
解析：主要测试强调句。从句子中可知被强调部分属于地点状语，而且the factory后含有一个定语从句：where his friend worked 。该题型属于高考中经常测试的强调句式和其它结构混合使用的情况。