第一节:单项填空(共15小题;每小题1分,满分15分)
从a、b、c、d四个选项中,选出可以填入空白处的最佳选项。
21 ---would you mind giving your advice on how to improve our learning efficiency ?
---if you make _______ most of forty-five minutes’ classes day after day, there will be _______ switch in grades.
a.不填; 不填 b.the; a c.不填; a d.the; 不填
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