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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1654

The old rules have to be ______ because they only applied to the circumstances that existed when they were made a hundred years ago.

A.developed B.established
C.observed D.revised
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Theoldruleshavetobebecausethey