As a student, you should do your duty an
题型:选择题
问题:
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
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