Do you know who lives in the building ________ there is a wall?
A.in front ofB.in front of whoseC.in front of whichD.in front which在线课程C
解析：
the building是先行词，可以看出，定语从句表达的意思是“在建筑物的前面有一堵墙”，即in front of the building there is a wall，显然，引导词要代替the building作定语从句中of的宾语。