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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 301

The professor could hardly find sufficient grounds________ his arguments in favor of the new theory.

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