I am exhausted and thirsty because I ___ for one hour without a break.a) have runb) have been runningc) rand) was running

To determine the correct answer for the sentence, we need to analyze the context and the grammatical structure.

1. Context: The sentence indicates a duration ("for one hour") and suggests an action that is ongoing or recently completed, leading to a state of exhaustion and thirst.

2. Tense Analysis:

   • a) have run: This suggests a completed action but does not emphasize the duration.
   • b) have been running: This indicates an ongoing action that started in the past and continues to the present, which fits well with the context provided.
   • c) ran: This is a simple past tense and implies a completed action without the ongoing aspect.
   • d) was running: This suggests a past continuous action but doesn’t indicate that it has relevance to the present moment.

3. Conclusion: The best choice is b) have been running because it conveys that the action of running took place over the hour and impacts the current state of the speaker.

Final Answer

b) have been running