这题选D为什么不行? 也可以说强调前面的内容啊?

这是强调句型．你把IT WAS 和 THAT去掉，它还是完整的意思，变成了 in the small house which was built with stones by his father
he spent his childhood

如果是D 的话，就完全不顺了，把IT WAS 和 THAT去掉，was built with stones by his father就没有主语了

你的问题很好，此题应该选A，是强调他的爸爸花了他的童年时间建立了这个石头的房子，第一个空为定语从句。此题若选D，则第二空有问题，WHICH不能修饰人，如果是强调前半句，则没有意义，已经说了是石头的房子，就不用在强调是石头的了，你想想是不是这个道理

It was …that 好像是固定的吧
况且他应该在强调的是house吧

你也可以这样想，it was之后包含in, 说明本句是强调他是在哪里度过童年的。

第一个空填which 和that是一样的,都对,而且没有区别.主要是看第二个空.
强调句的句型是:"It is....that....",如果强调的是人,那么就把that 换成who.
你再看看,句中缺什么,不就是一个that 嘛,所以选A.至于你的D项,强调句里是没有用which的. which 只有在定语从句中作关系代词.

我给你把句子拆分一下
It was in the small house ____he spent his childhood.
此为句子主句，为强调地点状语的强调句，应填that

the small house ____ was built with stones by his father
house后面带有了定语从句，关系代词在定语从句中作主语，指物，that,which均可，只是主句中有个that,所以这里还是用which的好