Over school has developed a learning system__students can do a lot of teamwork

题目

Over school has developed a learning system__students can do a lot of teamwork
A.that B.when C.which D.where
选C的话不就是先行词“a learning system”作后面从句的定语,翻译：我们学校发展了一种学生们可以做集体活动的系统.
答案是先行词作后面从句的地点状语.
像这种关系代词在从句中作定语与关系副词引导的定语从句我一直分不清,怎样才能分开?

答案