标题: OG 18 759 关于代词指代问题，难道与我一直的观念相反？？ [打印本页] 作者: DreamTurelater 时间: 2018-8-3 16:51 标题: OG 18 759 关于代词指代问题，难道与我一直的观念相反？？ [attach]222784[/attach]
答案为B
官方解释：
The subject of the sentence is the plural fossils , not
sloth , and therefore requires a plural verb. It therefore does not have a singular antecedent. To clarify the identifi cation of the oldest known mammal, the noun the sloth must be explicitly identifi ed.