问题
选择题
You can find me easily, for there is only one house _______ roof is flat.
A．whose
B．of which
C．of that
D．that
答案
答案：A
考查定语从句的关系词。House是先行词，定语从句_______ roof is flat缺少roof的定语，所以选A。相当于of which the roof is flat.