og085 代词

ileisure

?? 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


CDE选项的代词有什么问题，我看到有PPT上说是前单后复，不能用代词。。不是很理解。。求详解

ileisure

定

jj449

同求问，这道题OG看了好几遍，总觉得没一个正确的。
呼唤解释！