There are more than fifty proposals ________ at the conference.A) discussedB) to be discussedC) discussingD) having been discussed

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There are more than fifty proposals ________ at the conference.A) discussedB) to be discussedC) discussingD) having been discussed
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There are more than fifty proposals ________ at the conference.A) discussedB) to be discussedC) discussingD) having been discussed
There are more than fifty proposals ________ at the conference.
A) discussed
B) to be discussed
C) discussing
D) having been discussed

There are more than fifty proposals ________ at the conference.A) discussedB) to be discussedC) discussingD) having been discussed
B 将被讨论或需要被讨论 将来+被动

A
很明显,这里是非谓语的形式,
而非谓语又3种形式。
分别是doing 表示事物与动作关系是主动的,或在进行的,强调动作
done表示事物与动作的关系是被动的,表示已经完成的,强调状态
to do 表示事物还没发生的,多用于将来