问题
选择题
Sometimes I work ______ the day and sometimes ______ night. [ ]
A. in; on
B. in; at
C. during; on
D. at; during
答案
答案：B
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Sometimes I work ______ the day and sometimes ______ night. [ ]
A. in; on
B. in; at
C. during; on
D. at; during
答案：B