【题目】There are two rooms on the first floor, is used as a reception room.
A. a smaller of which B. a smaller of them
C. of which the smaller D. the smaller of them
在线课程【答案】C
【解析】考查定语从句。逗号后是一个非限定性定语从句；表示“两者中较小的一个”时，要在比较级前加定冠词the。of which the smaller=the smaller of which。句意：一楼有两个房间，其中较小的那个用作接待室。