Sometimes I work the day and sometimes night. A. on atB. at on C. at inD. in at

问题补充：

Sometimes I work the day and sometimes night.

A. on, at

B. at, on

C. at, in

D. in, at

答案：

A. on, at

B. at, on

C. at, in

(答案→)D. in, at

解析：在白天用介词during或in，而在夜晚用介词at，故选答案为D