问题补充：
The building windows are bright at night is our school library.
A. that
B. which
C. whose
D. of which
答案：
A. that
B. which
(答案→)C. whose
D. of which
解析：本题考查冠词。分析句子结构可知，该空所填词用来引导定语从句，且在从句中作定语，所以答案为C项。关系代词whose在从句中作定语指物时，可与of which转换。即：物+whose+名词=物+of which + the +名词=物+the+名词+of which.
