他要是细心一点的话可以做的更好英语翻译he could have done better if he ( )( )more careful
问题描述：
他要是细心一点的话可以做的更好英语翻译he could have done better if he ( )( )more careful
答
had been 与过去时相反的虚拟语气.此处主句could have done （相对从句退一步）从句应该是对应的had been.