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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 979

—I wonder why the thinnest plastics bags, though ________ , are still in use here.
—Well, it’s no easy job to solve this problem effectively.

A.banning B.banned C.to ban D.having banned
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相关知识点

—Iwonderwhythethinnestplastics