问题补充：
He bought a house, the price is reasonable.
A. whose
B. its
C. of which
D. of whom
答案：
A. whose
B. its
(答案→)C. of which
D. of whom
解析：考查非限制性定语从句。先行词a house在从句中做定语，使用whose+n或of+which +the +n或the +n +of which，根据结构排除答案A,答案D是指物，也排除，故选C。句意：他买了一套房，房子的价格很合理。
