问题
选择题
We usually work ____ the day and sleep ____ night. [ ]
A. on; at
B. during; in
C. on; in
D. during ; at
答案
答案：D
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We usually work ____ the day and sleep ____ night. [ ]
A. on; at
B. during; in
C. on; in
D. during ; at
答案：D