They for seven hours. ( have worked / working / was working ) Fill in the blanks with the tense of the verbs stated in the brackets:

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Explanation:

They have worked  for seven hours. It just makes the most logical sense.

They working for seven hours? That doesn't make sense because it's not in the present.

They was working for seven hours? It just doesn't make sense especially when you say it out loud.

I hope this helps!

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Explanation: