题目内容：
根据以下材料，回答题Mrs.Janesgavemusiclessonsataschool.Shehadagoodvoiceandenjoyedsinging,exceptthatsomeofherhightonessoundedlikeagatethathadbeenforgottentooil.Mrs.Janesknewherweaknesswell,andtookeverychanceshecouldtopracticethesehightones.Asshelivedinasmallhouse,whereshecouldnotpracticewithoutdisturbingtherestofthefamily,sheusuallywentforlongwalksalongthecountryroadswhenevershehadtimeandpracticedherhightonesthere.Wheneversheheardacarorapersoncomingalongtheroad,shestoppedandwaiteduntilshecouldnolongerbeheardbeforeshestartedpracticingagain,becauseshewasashyperson.
Oneafternoon,afast,openedcarcameupbehindhersosilentlyandsofastthatshedidn'thearituntilitwasonlyafewyardsfromher.Shewassingingsomeofherhighestandmostdifficulttonesatthattimeandasthecarpassed;shesawan.anxiousexpressioncameoverthedriver'sface.Hestoppedhiscarsoddenly,jumpedoutandbegantoexamineallthetyrescarefully.
Mrs.Janesdidn'tdaretotellhimwhatnoisehehadheardreallywas,sohegotbackintothecaranddroveoff.
HowdidMrs.Janessing?______ A．Shesangwell,butshedidn'tpracticesinginghard.
B．Sheenjoyedsinging,butshehadaterriblevoice.
C．Shewasagoodsinger,butshecouldnotsingthehightoneswell.
D．Shesangterribly,andshewasnotsingeratall.
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答案解析：