The problem is believed ____at the meeting two days ago.

A to have discussed B to have been discussed C being discussed D having been discussed
其他都明白，但是bd到底区别在哪里，为什么就不能选d呢？
这两个不是都表示动作发生在believed之前吗。
discuss还是抽象的动作。

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推荐答案 2013-04-10

二者均为非谓语动词，
to have been discussed 不定式的现在完成时的被动时态。不定式一般表示将来和目的。
having been discussed 现在完成进行时的被动语态。强调正在进行的动作。
该句子不是表示当时（the meeting two days ago）正在进行的讨论，而是表示已经在那次讨论过了。来自：求助得到的回答

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第1个回答 2013-03-21

呃，楼主想太多了。。

其实是因为be believed to do sth. 是一个固定结构
所以不能用having

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