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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...

A.referring B.referred to C.referring to D.were referred
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SomeproblemsinthelecturebyMr.S