TT GWD 5-1 how to use "date"

xiaobenzhu

    

Q1:

    

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

    

 

    

1. both dating
2. both of which have dated
3. and each has dated
4. and each one dating
5. each one of which date

how to deal with this "date", i remembered that something is special with it, but I have already forgot about it. Can sb help me?
Thanks a lot.

xiaobenzhu

Up

lbd2006

答案是A吗？

xiaobenzhu

yes, the answer is A. But can you tell me how to deal with this "date"?

Winbolin

up!!