the difference between of which and whose

你是不是看错答案了?这是06年江苏卷的高考题改遍的.
原题.
The owner of the cinema needed to make a lot of improvements and employ more people to keep it running,______ meant spending tens of thousands of pounds.( 2006江苏卷)
A.who B.that C.as D.which
你的那个第一题应该是选B的,这个题考察Which引导的非限制定语从句,表示解释说明.如果选A,whose后面还要加中心词.
这个题的意思是,这个电影院的老板需要对电影院做很多的改进,还有雇佣更多的人来维持运行,这些意味着要花费很多的钱.
第二题这可以是whose,如果是Of which应该是这样的：
Don't get too close to the house of which the roof is under repair.
要加上定冠词THE,表示特指.
这里有更详细的资料,