This is one of the problems at the meeting at present.A. discussedB. discussingC. to be di

问题补充：

This is one of the problems at the meeting at present.

A. discussed

B. discussing

C. to be discussing

D. being discussed

答案：

A. discussed

B. discussing

C. to be discussing

(答案→)D. being discussed

解析：考查分词用法。根据后面的at present目前,现在；可知是指正在发生的动作。根据句意可知问题正在被讨论。句意：这是一个在现在的会议上正在被讨论的问题之一。