题目内容：
根据以下材料，回答题WhenMaryMoorebeganherhighschoolin1951,hermothertoldher,"Besureandtakeatypingcoursesowhenthisshowbusinessthingdoesn'tworkout,you'llhavesomethingtorelyon."Maryrespondedintypicalteenagefashion.Fromthatmomenton,"theverylastthingIeverthoughtaboutdoingwastakingatypingcourse."sherecalls.
Theshowbusinessthingworkedout,ofcourse.Inhercareer,Marywonmanyawards.Onlyrecently,whenshebegantowriteGrowingUpAgain,didsheregretignoringhermom,"Idon'tknowhowtouseacomputer."sheadmits.
Unlikeher1995autobiography,afterall,hersecondbookislessaboutlifeasanaward-winningactressandmoreaboutlivingwithdiabetes(糖尿病).AllthemoneyfromthebookisintendedfortheJuvenileDiabetesResearchFoundation(JDRF),anorganizationsheservesasaninternationalchairman."Ifelttherewasaneedforabooklikethis,"shesays,"Ididn'twanttolecture,but!wantedotherdiabeticstoknowthatthingsgetbetterwhenwe'reself-controlledanddoourpartinmanagingthedisease."
Butshehasn'talwayspracticedwhatsheteaches.Inherbook,shedescribesthatawfulday,almost40yearsago,whenshereceivedtwopiecesoflife-changingnews.First,shehadlostthebabyshewascarrying,andsecond,testsshowedthatshehaddiabetes.Inachildlikeact,sheleftthehospitalandtreatedherselftoaboxofdoughnuts(甜甜圈).Yearswouldpassbeforesherealizedshehadtogrowup-again-andtakecontrolofherdiabetes,notletitcontrolher.Onlythendidshekickherthree-pack-a-daycigarettehabit,overcomeheraddictiontoalcohol,andbegintofollowabalanceddiet.
Althoughherdiseasehasaffectedhereyesightandforcedhertothesidelinesofthedancefloor,sherefusestofallintoself-pity."Everybodyonearthcanask,'whyme?'aboutsomethingorother,"sheinsists,"Itdoesn'tdoanygood.Nooneisimmunetoheartache,pain,anddisap-pointments.Sometimeswecanmakethingsbetterbyhelpingothers.I'vecometorealizetheimpor-tanceofthatasI'vegrownupthissecondtime.IwanttospeakoutandbeashelpfulasIcanbe."
WhydidMaryfeelregretful? A．Shedidn'tachieveherambition
B．Shedidn'ttakecareofhermother
C．Shedidn'tcompleteherhighschool
D．Shedidn'tfollowhermother'sadvice
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答案解析：