问题补充:
There are two caps on the table, belongs to Tom.
A. the smaller of which
B. the small of that
C. the smaller of them
D. the small one
答案:
(答案→)A. the smaller of which
B. the small of that
C. the smaller of them
D. the small one
解析:句意:在桌子上有两顶帽子,其中比较小的那顶是汤姆的。这里是非限制性定语从句,that不能引导非限制性定语从句,故排除B;又因为逗号前后都是句子,所以缺少连词,故排除CD;which在从句中作主语,故选A。