OG085关于省略！！！！！！！！！

柠檬麦胖兜

85.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
(E) flourishing at the same time as those were



为什么A选项里civilization后面不用加did？关于省略还是有一些不清楚，除了，be/become的情况，还有哪些在重复时需要
省略呢？？？求指导！！！！！！！！！！！！

tthere

还有啊，为什么就不能用过去完成时，前面不是有一个threaten是过去时么，不可以那他当时间标志么？我知道很弱智的问题……

tthere

同问~~求解答~~~另外d选项我知道不好 但为什么不可以？

imajuana

除了be become外一些介词在重复时也省略
但是最后加不加do/be我也没弄懂