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题目内容双击单词支持查询和收藏哦～
When studying human history, one must be aware that the _____ between historical periods are arbitrary; certainly none of the people alive at the time were aware of a shift from one era to another.
- A.judgements
- B.ideologies
- C.innovations
- D.demarcations
- E.episodes
D显示答案
以上解析由 考满分老师提供。
