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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1227

The companies are working together to create _____ they hope will be the best means of transport in the 21st century.

A.which B.that C.what D.who
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Thecompaniesareworkingtogether