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In which sentence are auxiliary verbs correctly used to...

In which sentence are auxiliary verbs correctly used to form the aspect intended?


A

By the end of this term, they are teaching English for ten years.


B

By the end of this term, they will have been teaching English for ten years.


C

By the end of this term, they have been teaching English for ten years.


D

By the end of this term, they were teaching English for ten years.


E

By the end of this term, they are been teaching English for ten years.