59-39=29．
答：第二次比第一次少用这根钢管的 29．
（）不是输卵管结扎术的适应症。
A.已婚、已生育要求绝育者
B.心脏病患者心功能2级以上
C.神经类型不稳定
D.第二次剖宫产时
E.正常分娩产后
Had he worked harder, he ________ the exam.[ ]
A. must have got through
B. would have got through
C. would get through
D. could get through
