单选题 He was found to be a thief, ______ disappointed his wife.
【正确答案】 C
【答案解析】[解析] 本题考查定语从句的关系代词。本题中空格处需要填入引导非限定性定语从句，且能指代完整主句内容的关系代词，只有which满足要求。故本题答案为C。