【题目】Lack of communication causes relationships to fail. My failure is a case in point, ______ I should learn a lesson.
A. in which B. to which C. from which D. by which
在线课程【答案】C
【解析】考查定语从句。句意：缺乏沟通会导致关系失败，我的失败就是一个很好的例子，我应该从中吸取教训。句中包含定语从句，先行词是a case指物，在定语从句中作状语，此处表示“从例子中”用from which，故选C.