There are more than 50 proposals ___at the conference.

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There are more than 50 proposals ___at the conference.
A.to discuss
B.to be discussed
C.discussing
D.having been discussed

这里是to引导的介词短语做proposals的后置定语,而这里显然不是主动的动作,所以又用了被动语态.至于D嘛,是现在完成进行时,不适合用在这种语境,意思和时态也不对.
现在完成进行时
其构成形式如下：
I / we / they have
He / she / it has been + 动词的现在分词
1）表示一个在过去开始而在最近刚刚结束的行动,如：
Ann is very tired.She has been working hard.
Why are you clothes so dirty?What have you been doing?
2) 表示一个从过去开始但仍在进行的行动,如：
It has been raining for two hours.(现在还在下)
Jack hasn’t been feeling very well recently.
3) 表示一个从过去开始延续到现在,可以包括现在在内的一个阶段内,重复发生的行动,如：
She has been playing tennis since she was eight.
4) 现在完成时强调动作行为的结果、影响,而现在完成进行时只强调动作行为本身,如：
Tom’s hands are very dirty.He has been repairing the car.
The car is going again now.Tom has repaired it.

There are more than 50 proposals ___at the conference. There are more than fifty proposals ________ at the conferen 英语翻译there are more than fifty proposals tto be discusssed at in the school there are more than one h( ) students. There are more than three _____workers in the factory. There are more mobile phones than people in the UK.... There are more than 200 c___in the word There are more than three weeks leave before the Christmas. There are more than two h____ countries in the world There are more people on the beach than _____ Are there any new ideas 〔〕at the conference There are 40 chickens on the farm.the hens are 8 more than t