Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in pakistan, the site of an ancient civilization (that flourished at the same time as the civilizations) in the Nile delta and the river valleys of the Tigris and Euphrates.
a) that flourished at the same time as the civilizations
b)that had flourished at the same time as had the civilizations
c)that flourished at the same time those had
d)flourishing at the same time as those did
e)flourishing at the same time as those were
关于e选项，我有两个疑问。请教一下
第一个，the same ... as地用法
为什么不要后面的were,是不是因为at the same time as这种情况不要
如果我说 I have the same XXX as you (have),这个时候后面的have还要不要
第二个，those 地用法，这里与those对应的前面的civilization是单数，但是those的那个位置应该是civilizations,是复数，og的解释是说those不能指代前面的civilization单数，那碰到这种问题，those是不是不能用了呢 | 
