OG11-75（the same as 用法总结）

(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

查了大全总结了一下the same as 的用法，但是未求证，大家看看对不对。

主语（可以是句子，短语，名词）＋谓语＋the same (这里可以有补语) as     ＋    （这里的结构要和主语相同就可以了，不需要添加动词和谓语平行）

这里不是the same as的用法。

at the same time修饰前面的。

as后面是个比较状语从句。

是不是d呢？

Salt deposits and moisture
            threaten
            to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization flourishing at the same time as
                    those
                    did
                in the Nile delta and the river valleys of the Tigris and Euphrates.

Is the answer A, omitting "did"

It's not clear what those refers to.