Question

Do you know the reason ____ she has changed her mind?

1. A.
   for that
2. B.
   which
3. C.
   why
4. D.
   of which

Answer 1

C
试题分析：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？
考点：考查定语从句
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。