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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1996

An invention is a new way of solving a problem, so try our best to think of many ________and unusual ways.

A.varying
B.variety
C.varied
D.variation
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Aninventionisanewwayofsolvinga