14. 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
如此题,为什么as从句后面的did可以省略阿,什么时候可以省略什么时候又不可以省略? than 引导的对比从句呢? 谢谢! |