请教大家个GWD上的问题

Young0822

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

想请问，E存在什么问题呢？这个不属于独立主格结构吗？

mycontrol01

each one的one没指代 需要一个单数

答案是A还是B..?  我蒙A好了..

飞行2010

应该是两个都。。。不是每一个。