By the time you--your teaching post next year,Della will have worked as a teacher here for13yearsA.will take upB.took up Ctake up Dare taking up

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By the time you--your teaching post next year,Della will have worked as a teacher here for13yearsA.will take upB.took up Ctake up Dare taking up
By the time you--your teaching post next year,Della will have worked as a teacher here for13years
A.will take upB.took up Ctake up Dare taking up

By the time you--your teaching post next year,Della will have worked as a teacher here for13yearsA.will take upB.took up Ctake up Dare taking up
A 表示将来