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Choose the right affirmative to fill in the blank, according to the example:
I studied this subject for 5 years. -> I have been studying this subject for 5 years.
I taught that subject for 10 years. -> _____________________
I have been taughting that subject for 10 years.
I have been taught that subject for 10 years.
I have been teaching that subject for 10 years.
I have been teach that subject for 10 years.