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

(A) to ratify the Equal Rights Amendment, begun almost two decades ago,

(B) begun almost two decades ago, for ratifying the Equal Rights Amendment

(C) begun for ratifying the Equal Rights Amendment almost two decades ago

(D) at ratifying the Equal Rights Amendment, begun almost two decades ago,（A）

(E) that has begun almost two decades ago to ratify the Equal Rights Amendment

由于我没有大全的讨论连接都不是987的,我也查阅的相关的解释,还是不太明白.

这里的begun almost two decades ago,是做插入语么?那这个begun是被动还是主动?如果是主动的话是说明插入语可以用谓语+(宾语)的结构么?