There will be more than five proposals at the meeting.A. having been discussedB. discussi

问题补充：

There will be more than five proposals at the meeting.

A. having been discussed

B. discussing

C. to be discussed

D. discussed

答案：

A. having been discussed

B. discussing

(答案→)C. to be discussed

D. discussed

解析：考查非谓语动词。句意：在会议上将有五条以上的建议被讨论。讨论的动作在将来，故用不定式的被动式表将来。在这里to be discussed 作后置定语，所以选C。