OG13 SC89中的比较问题

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89.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 thecivilizations in the Nile Delta and the river valleys of the Tigris and Euphrates.

(A) that flourished at the same time as the civilizations(correct)
(B) that had flourished at the same time as had thecivilizations
(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

想问下这句是什么与什么的对比？是time与time的对比还是一个文明与另外两个文明的对比？
不是说as表示对比的时候只能借整个句子吗？为什么这里as之后跟的是短语啊？

求大神指点！！跪谢！！

piggylele

that flourished at the same time as the civilizations in the Nile Delta and the river valleys of the Tigris and Euphrates.
as the civilizations （flourished）in the Nile Delta....
这样省略了flourished 避免重复

651340199

piggylele 发表于 2013-8-16 14:26
that flourished at the same time as the civilizations in the Nile Delta and the river valleys of the ...

好的～～明白了～～多谢了

YvaineDing

piggylele 发表于 2013-8-16 14:26
that flourished at the same time as the civilizations in the Nile Delta and the river valleys of the ...

谢谢楼主！！那么什么情况下可以省略呢？？这样对比的两边不就不对称了

小臣

piggylele 发表于 2013-8-16 14:26
that flourished at the same time as the civilizations in the Nile Delta and the river valleys of the ...

........., the site of an ancient civilization that flourished at the same time as the civilization (flourished) in the …….  
请问牛牛，这个比较是严格对应的吗？谁和谁对应啊...看不太懂...