题目内容：
根据以下材料，回答题Somepeopledonotlikeanythingtobeoutofplace.Theyareneverlateforwork;theyreturntheirbookstothelibraryontime;theyrememberpeople'sbirthdaysandtheypaytheirbillsassoonas
theyarrive.Mr.Brownissuchaperson.Mr.Brownworksinabank,andlivesonhisown.Hissisterlivesinthenexttownwithherhusband,andherson,Mark.Mr.Browndoesn'tseehissisterorher
familyfromoneyeartothenext,buthesendsthemChristmascards,andhehasn'tforgottenoneofMark'sseventeenbirthdays.LastweekMr.Brownhadquiteasurprise.Hedrovehomefromthe
bankattheusualtime;drivingneithertooslowlynortoofast,heparkedhiscarwherehealwaysparkedit,outofthewayofothercars,andhewentinsidetomakehiseveningmeal.Justthenthere
wasaknockatthedoor.Mr.Brownopenedthedoortofindapolicemanstandingonthedoorstep.
"WhathaveIdonewrong?"Mr.Brownaskedhimself."HaveIdrivenonthewrongsideoftheroad?Hastherebeensometroubleatthebank?HaveIforgottentopayanimportanttbill?"
"Hello,uncle,"saidthepoliceman,"Myname'sMark."
Mr.Brown A．worksonhisowninabank
B．livesinabankandworksonhisown
C．livesbyhimselfandworksinabank
D．liveswithhissisterandworksbyhimself
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答案解析：