Fill in the gaps. She ... (run) for an hour.

The correct answer is "has been running". **Explanation:** The sentence requires the present perfect continuous tense because it describes an action that started in the past, continues up to the present moment, and we know the duration of the action. * **ran** is the simple past tense, it indicates a completed action in the past. * **have been running** uses 'have', which is not correct with 'She'. 'Have been running' is correct for 'I, we, you, they' * **run** is the base form of the verb, used in the present simple, and this is not correct in this context. * **has been running** is the present perfect continuous form, and it fits perfectly in the context. It shows that the action of running started in the past and continues for a period of time up to the present. Therefore, the completed sentence is: 'She **has been running** for an hour.'