如I am as old as you are,是不是are一定不能省略?
I am older than you are是不是 are也不能省略?
还有一道题目:Salt deposits and moisture threaten to destroy the Mohenlo-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(did).这里要这个did吗?答案里面没有,是省略了吗?求大神解答,不胜感激!