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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 1201

Scientists have created GM tomatoes which ______ fresh for 45 days, three times as long as normal tomatoes.

A.are stayed B.have been stayed C.stay D.stayed
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ScientistshavecreatedGMtomatoe