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Read the sentence below and classify it according to its verb tense and function.
He´s been studying in the library for four hours!
Present Perfect Continuous was used to emphasize the duration of an action that started in the past and continues up to the present.
Present Perfect Continuous was used to describe a recent action.
Present Perfect was used to emphasize the duration of an action that started in the past and continues up to the present.
Present Continuous was used to describe an ongoing action.