关于主谓一致的单复数问题 this one must have been in the possession of a private collector and somehow managed to escape. 为什么用Have been 不用 Has been 不是单数么
人气：285 ℃ 时间：2020-05-19 05:16:51
解答
this is one of the possession of private collectors 这是其中一个,所以have been是用来表示private collectors帮我看看你下面那个人说的那个对么。。。应该跟情态动词没有关系吧。。。must has been done 也是存在的 对么？要是有must 後面是跟 bare infinite就是 must be in the...
