题目内容：
根据以下材料，回答题LindaEvanswasmybestfriend--likethesisterIneverhad.Wedideverythingtogether:pianolessons,movies,swimming,horsebackriding.
WhenIwas13,myfamilymovedaway.LindaandIkeptintouchthroughletters,andwesaweachotheronspecialtime--likemyweddingandLinda's.Soonwewerebusywithchildrenandmov-ingtonewhomes,andwewrotelessoften.Onedayacardthat!sentcameback,stamped"AddressUnknown."IhadnoideahowtofindLinda.
Overtheyears,ImissedLindaverymuch.Iwantedtosharehappinessofmychildrenandthengrandchildren.AndIneededtosharemysadnesswhenmybrotherandthenmotherdied.Therewasan
emptyplaceinmyheartthatonlyafriendlikeLindacouldfill.
OnedayIwasreadinganewspaperwhenInoticedaphotoofayoungwomanwholookedverymuchlikeLindaandwhoselastnamewasWagman--Linda'smarriedname."Theremustbethou-sandsofWagmans,"Ithought,butIstillwrotetoher.
Shecalledassoonasshegotmyletter."MrsTobin!"shesaidexcitedly,"LindaEvansWag-manismymother."
MinuteslaterIheardavoicethatIknewverymuch,evenafter40years,laughedandcriedandcaughtuponeachother'slives.Nowtheemptyplaceinmyheartisfilled.Andthere'sonethingthat
LindaandIknowforsure:Wewon'tloseeachotheragain!
ThewriterwenttopianolessonswithLindaEvans__________. A．attheageof13
B．beforeshegotmarried
C．aftertheymovedtonewhomes
D．beforethewriter'sfamilymovedaway
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答案解析：