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      Afterseveralyearsofobservation,theresearchgroup

  •       Afterseveralyearsofobservation,theresearchgroup

  • 问题详情：      Afterseveralyearsofobservation,theresearchgroup______theconclusionthatlanguageacquisitionisfasterwhenstudents______tothesituationwhereitisspoken.A.hascometo;expose                 B.havearrivedat;areexposedC.hasco...
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