—Would you mind giving your advice on how to improve our efficiency? —If you make most of

—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; /

A. /; /(答案→)B. the; aC. /; aD. the; /解析：句意：你介意给我关于怎么提高效率的建议吗？--如果你能充分利用每天的45分钟课堂，成绩会有所转变的。第一空填the，make the most of充分利用，第二空填a， 这里switch是抽象名词具体化，表示“一种转变”，所以选B。

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