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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1647

The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others.

A.were it not for B.had it not been because
C.had it not been for D.if it had not been
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Theachievementsofthegreatestmi