However, Fredrick William I, to whom the Amber Room belonged, decided not to keep it.(人教版高中英语第二册 unit1)
介词加whom是定语从句的一种形式,它用在定语从句中使得主句与从句关系紧密。
例如:The lecture in which the boy was interested will be conducted next week. 那孩子感兴趣的讲座下周举行
which与whom的区别在于先行词是指人还是指事物,人用whom 事物用which