问题
选择题
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
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。