People were different in those days.However he treated her,my grandfather（ ）my grandmother.A:would never leaveB:would never have leftC:had never leftD:will never have left正确答案是B为什么
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B因为 he treated her .是过去时
my grandfather（ ）my grandmother.这个意思是 我grandfather 永远不会离开 我grandmother .过去时的话,那么 将来的 就必须是过去将来时了,之所以用 have left 因为 强调 我GRANDFATHER 对她老婆 以前也不离弃 .