My sister , my family are proud, was admitted to Tsinghua University last autumn.
A. who
B. which
C. in which
D. of whom
网友回答
A. who
B. which
C. in which
(答案→)D. of whom
解析：句意：我们家引以为荣的我的姐姐去年秋天被清华大学录取了。这里使用了定语从句，先行词是my sister，定语从句中使用了be proud of sb，所以用of whom引导定语从句，选D。