It was in the factory his friend worked he picked up a lot of experience.A. where where

问题补充：

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

答案：

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。