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