There are two small rooms in the house serves as a kitchenA. the smaller of whichB. the

问题补充：

There are two small rooms in the house, serves as a kitchen

A. the smaller of which

B. the smallest of which

C. the smaller of them

D. the smaller one

答案：

(答案→)A. the smaller of which

B. the smallest of which

C. the smaller of them

D. the smaller one

解析：从结构看是非限定性定语从句，排除C、D（如果句子中间的逗号改成句号，则C、D正确），又因为是两者之间用比较级，排除B。