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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 at the civilizations ) in the Nile delta and the river valleys of the Tigris and Euphrates.

A.
D flourishing at the same time as those did.

Key is A.

But A missed "did", why not D?
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you mistyped the "as" in key A, right?

(i) "those" has no logical referent in the former part of the sentence - "those" can't refer to "civilization" which is singular.
(ii)if you choose d, what does "did" refer to? the "flourishing" is not a verb.

Remember:  "did" can be emited in this case. There are so many such cases in GMAT and lucylu has pointed out many times in posts on this board

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