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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:915

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.

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