求问it代词的指代问题【JapanreceivedhugesumsofcapitalfromtheUnitedStatesaftertheSecondWorldWar,usingittohelpbuild】amodernindustrialsystem.【划线部分】A)JapanreceivedhugesumsofcapitalfromtheUnitedStates

　　求问it代词的指代问题

　　【JapanreceivedhugesumsofcapitalfromtheUnitedStatesaftertheSecond

　　WorldWar,usingittohelpbuild】amodernindustrialsystem.

　　【划线部分】

　　A)JapanreceivedhugesumsofcapitalfromtheUnitedStatesafterthe

　　SecondWorldWar,usingittohelpbuild

　　B)JapanreceivedhugesumsofcapitalfromtheUnitedStatesafterthe

　　SecondWorldWarandusedittohelpinbuilding

　　C)JapanusedthehugesumsofcapitalitreceivedfromtheUnitedStates

　　aftertheSecondWorldWartohelpbuild

　　D)Japan’shugesumsofcapitalreceivedfromtheUnitedStatesafterthe

　　SecondWorldWarwereusedtohelpitinbuilding

　　答案说A选项的ing分词短语中的it语法上指代了theUnitedStates,从哪里看出来呢?

　　A选项简化是Japanreceivedhugesumsofcapital,(japan)useittohelp?