ACCorDing to thE Author, thE DistinCtion BEtwEEn violEnt ACts AnD non-violEnt onEs in sports is ______. A．impossiBlE to mAkE B．not vEry ClEAr in Any CirCumstAnCEs C．too oBvious to EsCApE oBsErvAtion D．not vEry DiFFiCult to mAkE iF Enough AttEntion is pAiD to
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