We often go to school 8:20 the morning. A. in atB. at inC. at onD. on in

问题补充：

We often go to school 8:20 the morning.

A. in, at

B. at, in

C. at, on

D. on, in

答案：

A. in, at

(答案→)B. at, in

C. at, on

D. on, in

解析：在具体的点时间前用介词at，而在早上，用介词in，故选答案为B