Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization that had flourished at the same time as had the civilizations in the Nile delta and the river valleys of the Tigris and Euphrates.
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酥酥Suz 2015-09-13 12:44:53
句子主语是threaten，现在时，就没必要用过去完成时（表过去的过去） had flourished...as had....
