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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1091

Katherine __________ on that poem for a month, and it's still not finished.

A.had been working B.has been working
C.has worked D.had worked
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Katherineonthatpoemforamonth,a