OG85

bispham

Salt deposit 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 Tigers and Euphrates.

A) that flourished at the same time as the civilizations
B) that had flourished at the same time as has the civilization

答案选A，解释B不应该用过去完成时态，这点有道理。但是A结尾不需要改为as did the civilizations 吗?

Leliolevine

有did最好，没有也不算错。如果其它选项有更严重的错误，就应该选这个。

wanrita

A项我整明白了，是对的。因为the same....as....结构as后可以接定语从句或是名词

但不明白D为什么错了。解释说those 不能代 an civilization, 但人明明代的是后面两者(Nile Delta and the river valleys )的civilizations.   而且有did, 则后面接的定语从句，怎么就awkward了呢，唉，碰上不好解释的OG是不是都用awkward啊。
为什么错了呢？