C.
it was...that 强调句型,故后一空用that
理由:判断强调句型的关键在于把it was/is...that去掉后原句仍成立.
所以原句可变为 From___ you talked about the collapsed constructions,the new ones were built.此句成立,其中地点状语提前.
也可为 The new ones were built from___ you talked about the collapsed constructions.
from为一介词,其后需要宾语,the place为名词,可做from的宾语.
where 引导一个定语从句,修饰the place.where 在从句中充当地点状语.
句意为:这些新的建筑就是建在你们谈论那些倒塌的建筑物的地方吗?