We are going to talk about the problem at the last meeting.A. discussedB. discussingC. to

问题补充：

We are going to talk about the problem at the last meeting.

A. discussed

B. discussing

C. to discuss

D. being discussed

答案：

(答案→)A. discussed

B. discussing

C. to discuss

D. being discussed

解析：考查分词用法。Problem与discuss构成被动关系，使用过去分词。Discussed at the last meeting修饰the problem. D项表示正在被讨论。句意：我们将要讨论上次会议上被讨论过的问题。