求助一选择题~

There are more than 50 proposals____at the meeting.

A.discussed B.discussing

C.to be discussed D.having been discussed

解释下 thx

C 将来被动

因为前面是 there are 所以A 答案错误

的答案是现在完成被动 与 are时态不符

選C的話應該是，There will be more than 50 proposals____at the meeting 吧。所以排除C

我選A

答案选择A，因为句子意思是在会议上有50多个计划被讨论到，注意是被动，所以理所当然选择A了。