The question at tomorrow’s meeting is of great importance.A. to discussB. being discussed

问题补充：

The question at tomorrow’s meeting is of great importance.

A. to discuss

B. being discussed

C. to be discussed

D. discussed

答案：

A. to discuss

B. being discussed

(答案→)C. to be discussed

D. discussed

解析：考查非谓语动词。根据语境可知问题即将被讨论，故用不定式的被动形式作定语。句意：明天即将在会议上被讨论的问题非常重要。