Question

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

Answer 1

A

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。