Answer:原句变型一下,提问者就一目了然了,如下：The house the windows of which are broken is unoccupied=The house whose windows are broken is unoccupied （这里of which=whose)主句：The house is unoccupied...thx，分析的很清楚再问一个哈，The possibility ___have to walk to the work was being discussed.A.that people would B.of which the people may 不学英语很多年了 现在很多都不理解， 多谢您的指教了。.