1.How long is it since your sister _________(become)a teacher?

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1.Howlongisitsinceyoursister_________(become)ateacher?1.Howlongisitsinceyoursister_________(become)a

1.How long is it since your sister _________(become)a teacher?
1.How long is it since your sister _________(become)a teacher?

1.How long is it since your sister _________(become)a teacher?
1.How long is it since your sister _has bacame________(become)a teacher?