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Choose the right affirmative to fill in the blank...

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. -> _____________________


A

I have been taughting that subject for 10 years.


B

I have been taught that subject for 10 years.


C

I have been teaching that subject for 10 years.


D

I have been teach that subject for 10 years.