【问】 The house the roof of which was damaged has now been repaired.

of which能否放在the roof之前?

【答】 在定语从句中充当定语的of which虽然可以放在它所修饰的名词之前，但比较少见：

1. the investigation of which the results will soon be published...(CGEL)

结果不久将公布的那项调查……

2. The house of which the roof was damaged has now been repaired. (CGEL)

房顶损坏的那所房子现在已经修好了。