单选题There were two small&

问题补充：

单选题Thereweretwosmallroomsinthehouse,_____servedasakitchen.A.the smaller one of whichB.the small oneC.the smaller of themD.and the smaller one of which

答案：

A解析句中用逗号,所以是定语从句；如果改为分号或者在空格前加and,则选the smaller of them.