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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 432

Half an hour has been made full ______ of _____ the problem.

A.using; studying B.use; to study
C.to use; to study D.use; studying
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Halfanhourhasbeenmadefullofthe