【关于人教版英语必修一Unit5课文的一个问题IneededhishelpbecauseIhadverylittleeducation.Ibeganschoolatsix.TheschoolwhereIstudiedforonlytwoyearswasthreekilomertesaway.Ihadtoleavebecausemyfamilycouldnotc】

　　关于人教版英语必修一Unit5课文的一个问题

　　IneededhishelpbecauseIhadverylittleeducation.Ibeganschoolatsix.TheschoolwhereIstudiedforonlytwoyearswasthreekilomertesaway.Ihadtoleavebecausemyfamilycouldnotcontinuetopaytheschoolfeesandthebusfare.Icouldnotreadorwritewell.Aftertryinghard,Igotajobinagoldmine,However,thiswasatimewhenonehadgottohaveapassbooktoliveinJohannesburg.SadlyIdidnothaveitbecauseIwasnotbornthere,andIworriedaboutwhetherIwouldbecomeoutofwork.

　　以上是课文选段,我想问的是“SadlyIdidnothaveitbecauseIwasnotbornthere,andIworriedaboutwhetherIwouldbecomeoutofwork.”这句have的后面为什么跟的是it而不是one呢?

　　恳请指教!Orz