这个句子的主句是The house had been taken down dan replaced by an office .Igrew up是主语the house的定语从句,来修饰限定“房子”是“我在里面长大”的房子.其实当被修饰的名词成分在定语从句中做宾语时,引导词which通常是省略的,也就是说,这个句子的完整形式是这样的：
The house which I grew up in had been taken down and replaced by an office building.
如果你选D的话,句子是这样的：
The house which I grew up in which had
been taken down and replaced by an office building.你读一下这个句子顺口吗?没有主句了.