单选题 My grandpa gave me a watch, which is made of gold, ______I keep to this day.
【正确答案】 D
【答案解析】解析:先行词是the watch,由两个并列的定语从句共同修饰。关系代词which在两个定语从句的成分不同:一个作主语,一个作宾语,故第二个which不能省略。