— Did Mike call you yesterday?— No but this morning he called my office.A. at; onB. on; o

问题补充：

— Did Mike call you yesterday?

— No, but this morning he called my office.

A. at; on

B. on; on

C. at; at

D. on; at

答案：

A. at; on

B. on; on

C. at; at

(答案→)D. on; at

解析： call on sb 拜访某人call at some place拜访谋地，所以答案D。