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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1744

The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.

A.to be based on B.to base on
C.which to base on D.on which to base
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Theprofessorcouldhardlyfindsuf