Please don’t get too close to the building roof is under repair.
A. which
B. of which
C. whose
D. that
网友回答
A. which
B. of which
(答案→)C. whose
D. that
解析：考查定语从句。本题定语从句的先行词是the building,在定语从句中whose修饰名词roof，在句中做定语。本句中的whose roof=the roof of which; that不能做定语，修饰名词；句意：请不要靠近那个屋顶在维修的大楼。故C正确。