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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 812

---How did you work out the difficult chemistry problem?
--- I worked it out by ________.

A.working with a group B.think very hard
C.ask the teacher for help D.doing oneself
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