有问就问，大家看一下哦！！！

In June of 1989, laceName w:st="on">PrincetonlaceName> laceType w:st="on">TownshiplaceType> approved a developer’s plans to build 300 houses on a large portion of the 210-acre site of the Battle of Princeton, one of only eight Revolutionary War battlefields that had remained undeveloped.

A   one of only eight Revolutionary War battlefields that had remained undeveloped

B   one of eight of the only Revolutionary War battlefields that have remained undeveloped

C   one of the only eight undeveloped Revolutionary War battlefields that remains

D  only one of eight Revolutionary War battlefields to remain undeveloped

E   only one of the eight remaining undeveloped Revolutionary War battlefields

这题中答案选了A， 但是我觉得过去完成时有些不妥阿。总觉得C也不错只是only改成了the only，但关键是Revolutionary  War  battlefields 从句时态用了现在时，表示遗迹到现在还保存着，我觉得现在时用的比过去完成时好，所以就选了C

但答案还是A 心中实在是不解，请大家给我一点点提示吧。

题和答案是哪来的？有官方的解释吗？

哦，对的，唉，我把这个给忘了。谢谢老兄拉