stard hard,__you're sure to have a good reselt.a so b and

问题描述:

stard hard,__you're sure to have a good reselt.a so b and

选B,and.这里是承接关系,不是因果关系.
study hard,and you're sure to have a good reselt.
努力学习,你就一定可以得到一个好的成绩.