He changed his mind，________ made his father very angry．

He changed his mind，________ made his father very angry．

A.which

B.that

C.\

D.in which

答案及解析： A

解析：

考查定语从句。关系代词which在非限定性定语从句which made his father very angry中作主语，指代He changed his mind这句话。that不能用于非限定性定语从句。