Queen Marry could trace her ___(祖先)back to about 900 years ago.是填ancestor还是ancestors?

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Queen Marry could trace her ___(祖先)back to about 900 years ago.是填ancestor还是ancestors?

Queen Marry could trace her ___(祖先)back to about 900 years ago.是填ancestor还是ancestors?
Queen Marry could trace her ___(祖先)back to about 900 years ago.是填ancestor还是ancestors?

Queen Marry could trace her ___(祖先)back to about 900 years ago.是填ancestor还是ancestors?
填ancestors
ancestor指一个祖先,是可数名词 ,可以有复数的形式.而ancestry则为不可数名词,指所有的祖先

肯定是ancestor

900年了起码有2个以上的祖先吧? 用复数

ancestors

个人认为要看上下文,两种情况都没有什么问题的。如果这个题目是初中或者高中的单项选择题,那太垃圾了!