又是一个弱弱的问题，就是没有搞清楚，大全614

我笨，我努力

614.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（A）

(E) flourishing at the same time as those were

为什么不用完成时，相对于threaten来说这个动作是以前就已经完成了的，所以我选了B。答案是A

horsefish

以下是引用我笨，我努力在2004-8-18 3:07:00的发言：

614.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（A）

(E) flourishing at the same time as those were

为什么不用完成时，相对于threaten来说这个动作是以前就已经完成了的，所以我选了B。答案是A

过去完成时是过去的的过去, 这里只有过去.