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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 990

Public service ads, also PSAs, often _________ for free, _________ to educate people about health, safety or any other problem that affects public welfare.

A.run; meant B.are run; are meant
C.are run; mean D.run; are meant
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Publicserviceads,alsoPSAs,ofte