Yesterday they talked about something important the phone.A. inB. ofC. fromD. on

问题补充：

Yesterday, they talked about something important the phone.

A. in

B. of

C. from

D. on

答案：

A. in

B. of

C. from

(答案→)D. on

解析：句意：昨天，他们在电话上谈论了重要的事。on the phone在电话上交谈，故选D。