If you make most of every minute in class day after day there will be switch in grades.A

问题补充：

If you make most of every minute in class day after day, there will be switch in grades.

A. /; /

B. the; a

C. /; a

D. the; /

答案：

A. /; /

(答案→)B. the; a

C. /; a

D. the; /

解析：考查冠词。第一空是固定词组make the most of充分利用；第二空用a表示泛指。句意：如果你充分利用课内外的每一分钟，在分数方面会有一个大的转变。故B正确。