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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:933

A lot of language learning,________ has been discovered,is happening in the first year of life,so parents should talk much to their children during that period.(2012·安徽,29)

A.as B.it C.which D.this
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Alotoflanguagelearning,hasbeen