问题OG11th-75

75题的答案是A:

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.

如果要讲求平行的话,为什么第二个civilization后面不把助动词给补充出来呀,比如加一个did?

谢谢!

that指代的是civilization 比较的对象是两地的civilization

（Pakistan的）civilization that flourished at the same time as the civilizations （the Nile delta..的） 

和助动词什么的没关系