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Theunderlinedsentenceinthelastparagrap


Theunderlinedsentenceinthelastparagraphprobablymeansthat______.

  • Atheproblemisnotapproachedstepbystep
  • Btheresearchessofarhavefaultsinthemselves
  • Ctheproblemistoodifficultforresearcherstodetect
  • Dresearchinthisareaisnotenoughtomakegeneralizedpatterns
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