关于独立主格的问题

allandu

The Acoma and Hopi are probably the two oldest surviving Pueblo communities, both dating back at least a thousand years.

A.    both dating
B.    both of which have dated  
C.    and each has dated
D.    and each one dating
E.    each one of which date

这里的both dating ....算是独立主格么？不是说独立主格必须式用each, with这样的，不能用复数么？

newalan

这里不是独立主格结构

jbc88

我记得是独立主格结构。。

n．+ n.; n. + -ed/ing 形式