It is said that the site of an ancient city at the bottom of the lake last month
来源：网络
时间：
推荐文章
It is said that the site of an ancient city ________ at the bottom of the lake last month．
A.has been discovered
B.was discovered
C.was being discovered
D.has discovered
试题答案
B
很明显这座古城的遗址是被人类所发现的，而且时间是在上个月，所以应该用被动语态的过去时。