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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 631

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It was ______ the 19th century_____ heat was considered to be a form of energy.

A.not until; that B.until; that
C.not until; when D.until; when
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.Itwasthe19thcenturyheatwascon