My little cat sleeps the day but night he begins to work.A. at atB. on inC. on atD.

问题补充：

My little cat sleeps the day , but night he begins to work.

A. at , at

B. on, in

C. on, at

D. during, at

答案：

A. at , at

B. on, in

C. on, at

(答案→)D. during, at

解析：考察介词。在表示时间时，在白天用介词in 或during the day，表示在白天，在晚上，用介词at ，联系下文the day和nigth，可知选D。