问题
选择题
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
答案
答案：B
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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：B
