新东方语法教程上的一个问题

tangjinxiong

An attempt to ratify the Equal Rights Amendment, begun almost two decades ago, has been unsuccessful despite efforts by important groups, including the National Organization for Women.

A选项是对的。可是begun是过去分词啊，怎么可以这样用的？为什么这里不是用began呢？

谢谢帮忙

请大家一定帮我解答一下！！！

elitist

此处的主语是An attempt，

谓语是has been。

一个句子只能有一个谓语，

一山不容二虎，

你说能用began吗？

其实，是attempt后用了不定式和过去分词做后置定语。

你再仔细看看。

Jarod

begin 这里是vt, 补全了应该是which was begun almost two decades ago