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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 444

In the old days, cows ________ farm work.

A.used to doing B.were used to doing
C.were used to do D.was used to do
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Intheolddays,cowsfarmwork.A.us