--- Would you mind giving your advice on how to improve our efficiency?
--- If you make most of forty-five minutes classes day after day, there will be switch in grades.
A./; /
B.the ; a
C./; a
D.the; /
B
题目分析:句意:--你介意给一些关于怎么提高效率的建议吗?--如果你充分利用每天的45分钟,成绩会有一个转变的。第一空填the, make the most of是固定词组“充分利用”,第二空填a,泛指“一个转变”,所以选B。