虚拟语气,脑壳发麻if the United States had built more homes for poor

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虚拟语气,脑壳发麻
if the United States had built more homes for poor people in 1995,the housing problems now in some parts of this country____
so serious.
A.wouldn't be B.will not have been
C.wouldn't have been D.would have not been.
选哪个?
各位高人讲解下自己如何记虚拟语气这一难老虎的.
我已经弄的晕乎乎了的.
其实我也选C的。
但是答案给的是A。

答案是A.为什么呢?
第一句是虚拟过去时"if the .had built" (had=过去时)
但关键是第二句,the housing problems NOW 又变成现在了.虚拟就是"如果以前怎么怎么,那现在的问题就不会那么严重".
因此,答案是A,wouldn't be (现在时)

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