英语的完型填空,应该选什么

题目

英语的完型填空,应该选什么
Life deponds exercise.This is true.Let's take (1 ）for lexample：if you want to study hard and get good marks,you must have good health.If you always stay up,you shouldget exercise to keep fit.Only ( 2 )this way can you have good health.
1.A teathers B student Cworks D doctors
2.A with B by C through D in
请说一下为什么选你选的答案

答案

b 根据后面努力学习考高分得出是个学生
d in this way 通过这种方法