【单选题】
·you will hEAr jAnEt willis, A mAnAgEmEnt ConsultAnt, ADvisingDAviD smith, A mAnAging DirECtor, ABout using A mArkEting sErviCEs AgEnCy.
·For EACh quEstion (23-30), mArk onE lEttErA,B、orC、For thE CorrECt AnswEr.
·AFtEr you hAvE listEnED onCE, rEplAy thE rECorDing.
jAnEt thinks thE kEy to A suCCEssFul CliEnt/AgEnCy rElAtionship isA.
B.
C.