单选题13.Things might have been much worse if the mother______on her right to keep the baby.
【正确答案】
B
【答案解析】本题考查虚拟语气的用法：从句表示与过去事实相反的假设，应该用过去完成时。例如：There are people who would never have fallen in love if they had never heard oflove．有些人若是从未听说过爱情，是绝不会坠入情网的。