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1.        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（A）

(E) flourishing at the same time as those were

should A be" that flourished at the same time as the civilizations did"

that flourished at the same time as the civilizations很好，不用加did,这里不存在歧义，加上有累赘之嫌。

即使要加入did,也应是：that flourished at the same time as did the civilizations.

不加最好。