问题补充：
David, I have been sharing a dorm for more than two years, is quite a funny guy.
A. of whom
B. with whom
C. in whom
D. from whom
答案：
A. of whom
B. with whom
C. in whom
D. from whom
解析：句意：和我住在一个宿舍两年多的David是很有趣的家伙。这里使用了定语从句，先行词是David，定语从句中使用share sth with sb，缺少介词with，可以放在关系代词whom前面，所以选B。
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