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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2054

There are three main classes of drugs, ________ has a different effect on the body.

A.each of them B.all of them
C.each of which D.all of which
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Therearethreemainclassesofdrug