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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1447

To live on Mars, you need to wear boots which ________ to prevent you from floating off  into space.

A.design B.designed
C.are designing D.are designed
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ToliveonMars,youneedtowearboot