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In which sentence are auxiliary verbs correctly used to form the aspect intended?
By the end of this term, they are teaching English for ten years.
By the end of this term, they will have been teaching English for ten years.
By the end of this term, they have been teaching English for ten years.
By the end of this term, they were teaching English for ten years.
By the end of this term, they are been teaching English for ten years.