几个虚拟语气的练习题14.He treated me as though/as if __B___ his own so

几个虚拟语气的练习题
14.He treated me as though/as if __B___ his own son.
A.I am B.I would be C.I was D.I were
15.I __D___ you some money,but I hadn’t any on me then.
A.would lend B.would have lent C.could lend D.may have lent
25.If it were not for the fact that you _C____ ill,I would ask you to do this right now.
A.were B.had been C.are D.should be
三个题,已经给出答案,但我不知道为什么选,

与过去事实不符的虚拟语气的形式是：从句用过去完成时,主句用过去将来完成时.