想问问have dated 和date 到底有什么区别

Olive.

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
为什么这道题的B是错的？

但是这道题可以用have been dated
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that
eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest
known asteroid impact on Earth.
A. has been dated to be 3.47 billion years old and thus is
B. has been dated at 3.47 billion years old and thus
C. have been dated to be 3.47 billion years old and thus are
D. have been dated as being 3.47 billion years old and thus
E. have been dated at 3.47 billion years old and thus are

Qingmangmiao

hi，我记得第一题主要错误不在时态。
C选项，both指的是前面出现的两个主语，他们date到某个时期，独立主格结构，both的指代非常清晰。
B选项：both of which have dated，which只能指代前面的communities.
两个问题，1、both就是名词，没有必要用 both of the two oldest communities ，这样其实是重复的。
2、从目的上，C选项，both 对应主句主语，dating是对are oldest的补充说明，表义很清晰。如果是B后面date对于前面的补充说明的关系就没这么强，变成，某某是最古老的，其中两个都date到，表义没有这么清晰。
3、至于用date ， 还是have dated， 我觉得都说的通，过去时表示动作结束了，现在完成时可以表示，过去的动作结束了，但是它的影响持续到现在，比如第二题。所以我觉得这里时态不是一个split。

PS：感觉很少会单纯比较过去时和现在完成时，如果遇到，一般时态从简。

NUS等我

同意楼上的
“从目的上，C选项，both 对应主句主语，dating是对are oldest的补充说明，表义很清晰。如果是B后面date对于前面的补充说明的关系就没这么强，变成，某某是最古老的，其中两个都date到，表义没有这么清晰。”
我也是这样认为的！