In English class, our teacher often creates an environment we are given the opportunity to solve problems ourselves．
A. when
B. which
C. where
D. that
网友回答
A. when
B. which
C. where
D. that
解析：考察定语从句。本定语从句是一个被动语态的形式，结构很完整，故使用关系副词，定语从句的先行词是environment，所以where正确。