He lives in a room faces the south.
A. whose windows
B. the window of which
C. whose the window
D. of which the windows
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A. whose windows
(答案→)B. the window of which
C. whose the window
D. of which the windows
解析：考查定语从句，先行词是a room，句意：他住在面朝南的房子里面。定语从句可以用whose windows或the window of which及 of which the windows，但因为定语从句的谓语是faces，所以window是单数。选B。