(单选题)

—Would you please give some advice on how to improve our efficiency?
—If you make most of every class, there will be switch in grades.

A./; /

B.the; a

C./; a

D.the; /

参考答案：B

参考解析：

考查不定冠词a与定冠词the。句意：你介意给一些关于怎么提高效率的建议吗？如果你充分利用每节课，成绩会有转变的。第一空make the most of是固定词组，表示“充分利用”；第二空泛指“一个转变”，填a。故选B。

知识点：

—Would you please give some advice on how to improve our efficiency?—If you make ______ most of every class, there will be ______ switch in grades.