Ifrailroadschargedallcustomersthesameaveragerate,theyargue,shipperswhohavetheoptionofswitchingtotrucksorotherformsoftransportationwoulddoso,leavingremainingcustomerstoshoulderthecostofkeepinguptheline.在这里面为什么who不是引导两个从句呢?而是都做leaving的主语从句呢?
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