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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 362

—Let’s go out for a walk.
—You’d better not. These days the air is getting much ________ than it was before.

A.better B.worse C.cleaner D.easier
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—Let’sgooutforawalk.—You’dbett