OG 11th 75

Salt deposits and moisture threaten to destroy the Mohejno-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

正确答案是A,我选的是B.

先不说应该是过去完成时还是过去时，但是A的as 后面不应该接did the civilizations么?我现在有点糊涂到底什么时候需要加助动词什么时候不需要加？

多谢指教！

an ancient civiliztion .....比较 the civilization,没有问题

我猜你是因为看到了后面的that flourished....才认为the civilization did...

前面部分没有宾语，这种情况下，我们后面是不需要加did的

只有完整的句子(有宾语）才需要加助动词

详细情况见这个帖子

http://forum.chasedream.com/dispbbs.asp?boardid=23&id=103101

另外，我认为这道题的答案是比较出来的。其他几个选项的错误更明显，更严重。