The two things they felt very proud were Jim’s gold watch and Della’s hair.
A. about which
B. of which
C. in which
D. for which
网友回答
A. about which
(答案→)B. of which
C. in which
D. for which
解析：这题考查定语从句，因为宾语从句中短语be proud后面缺少介词of，所以用of which，句意是：他们感到自豪的两件事是：吉姆的金表和德拉的头发。选B。