问题
选择题
Do you know the reason ____ she has changed her mind?
A．for that
B．which
C．why
D．of which
答案
答案：C
题目分析：考查定语从句;先行词是the reason，定语从句中缺少原因状语，用why引导定语从句，句意：你知道她改变主意的原因吗？
点评：考查定语从句重点看先行词和从句的成分，从句缺少主宾表用关系代词，缺少状语用关系副词。