Had I known that air conditioners cause so much pollution ,I _ one.
问题描述：
Had I known that air conditioners cause so much pollution ,I _ one.
A:would never have bought
B:would haven't bought
C; must never have bought
D; must haven't bought
答
A
是虚拟语气的用法,如果我知道···,我就不会····与过去事实相反,可能是现在已经买了