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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1999

—I have worked hard at math, but it seems that I haven’t made any progress.
—Keep on _____ at it, and you will be successful.
A. work B. working  C. to work 

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—Ihaveworkedhardatmath,butitse