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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
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It is the idea____smiles can get rid of cold ____has been proved by the researchers many times.

A.which; which B.that; that C.that; which D.which; that
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Itistheideasmilescangetridofco