◎ 题干
As a student, you should do your duty and put your heart into study ______.

[      ]

A. at one time
B. at all times
C. at a time
D. at times

◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“As a student, you should do your duty and put your heart into study ______. [ ]A. at one time B. at all times C. at a time D. at times …”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。