题目内容：
根据以下材料，回答题MarriageisstillapopularinstitutionintheUnitedStates,butdivorceisbecoming21as"popular".MostAmericanpeoplegetmarried,22,atthepresenttime,andfiftypercentofAmerican
marriagesend23divorce.However,fouroutoffivedivorcedpeopledonot24single.Theygetmarriedasecondtimeto25partners.Sociologiststellusthatinthenextcentury,26Americanpeople
willmarrythree27fourtimesinonelifetime.AlvinToffler,anAmericansociologist,28thisnewsocialformserialmarriages.InhisbookFutureShock,Tofflergivesmany29forthischangein
Americanmarriage.Inmodernsociety,30livesdon'tstaythesameforverylong.Americans31changetheirjobs,theirhomes,andtheircirclesof32.So,thepersonwhowasa33husbandorwife
tenyearsagoissometimesnotasgoodtenyears34.Aftersomeyearsofmarriage,ahusbandandwifecan35thattheirliveshavebecomeverydifferent,andtheydon't36thesameinterests
anymore.Forthisreason,Tofflersays,peopleinthetwentyfirstcenturywillnot37tomarry.onlyonepersonforan38life-time.Theywillplantostaymarriedtoonepersonforperhapsfiveortenyears,andthenmarry39.MostAmericanswillexpecttohavea"marriagecarrier"that40threeorfourmarriages.
________ A．already
B．almost
C．ever
D．even
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答案解析：