题目内容：
根据以下材料，回答题 WhatShouldISaytothePersonWhoHasCancer?
Itisnormaltofeelthatyoudon'tknowwhattosaytosomeonewhohascancer．Youmightonlyknowthepersoncasually,oryoumayhaveworked（51）orlivedneareachotherformanyyearsandhaveacloserrelationship．Themostimportant（52）youcandoistoacknowledgethesituationinsomeway--whateverismostcomfortableforyou．Youcanshowinterestandconcern,youcanexpressencouragement,oryou（53）offersupport．Sometimesthesimplestexpressionsofconcernarethe（54）meaningful.
Whileitisgoodtobeencouraging,itisalsoimportant（55）toshowfalseoptimismortotellthepersonwithcancertoalwayshaveapositiveattitude．Doing（56）thingsmaydiscounttheirfears,concerns,orsadfeelings．Itisalsotemptingtosaythatyouknow（57）thepersonfeels．Whileyoumayknowthisisadifficulttime,noonecanknowexactlyhowthepersonwith（58）feels．Humorcanbeanimportantway（59）coping．Itisalsoanothersourceofsupportandencouragement．Letthepersonwithcancer（60）thelead;itishealthyiftheyfindsomethingfunnyaboutasideeffect,likehairlossorincreasedappetite,andyoucancertainlyjoin（61）inagoodlaugh．Thiscanbeagreatwaytorelievestressandtotakeabreakfromthe（62）seriousnatureofthesituation.
Whenthepersonwithcancerlooksgood,letthemknow!Refrain(忍住)（63）commentswhentheirappearanceisn'tasgood,suchas"You'relookingpale,"or"You'velostweight."
Canceranditstreatmentcanbeveryunpredictable．Bepreparedforgooddaysandbad（64）Refrainfromtellingthepersonwithcancerstoriesaboutfamilymembersorfriendswhohavehadcancer．Everyoneisdifferent,andthesestoriesmaynotbehelpful．Instead,itisbettersimplytotellthemyouknow（65）aboutcancerbecauseyou'vebeenthroughitwithsomeoneelse.
回答(51)题 A．hard
B．together
C．often
D．once
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答案解析：