With an appropriate relative pronoun:
(1)Do you know the reason ____ she has changed her mind? (2)The woman ____ is talking to my mother is a friend of hers.
【正确答案】：why;who/that
【题目解析】：【考点点击】本题考查关系代词。【要点透析】第一句是why引导的定语从句,整个从句修饰先行项 the reason,起补充说明作用。第二句中定语从句的先行项 The woman为人,关系代词可用who或that,在定语从句中作主语。
