关于date back to的一个疑问

antheabobo

A Harvard anthropologist has proposed that using fire to cookfood could be dated back to almost two million years and thatit could explain hominid features like having a large brain andsmall teeth.




A.using fire to cook food could be dated back to almost two million years and that it could explain hominid featureslike having


B.the use of fire to cook food could date back almost two million years and could explain such hominid features as


C.cooking food with fire could date back to almost two million years, explaining hominid features like


D.fire used to cook food could date back almost two million years ,explaining hominid features such as having.


E.fire used for cooking food could be dated back to almost two million years and explain hominid features like.
这道题选B没有问题，但是为什么B是date back而不是date back to呢

咖啡印象

个人理解：一般date back 后面跟时间长度，而date back to的后面接的是具体时间点