题目内容：

选哪个,为什么?
the prices of the houses in big cities have ____ so quickly that a lot of people can't afford a house.
A.discovered B.improved C.increased D.reduced

优质解答

C
discovered 是发现的意思improved为提高自己提升自己的意思
reduced 减少的意思 reduce.to就是迫使某人沦落到某种状态
这里的意思就是在大城市需要房子的价钱已经增加了如此快,以至于许多人无法买得起房子
so .that.如此.以至于无法.