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Here is ur answer ..plz refer the image given ..
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<span>Native American Societies thats your answer ...................................................................................................................................................................................</span>
The correct answer is was working.
You need to use past continuous tense (was working) to denote that an action which was being processed for a period of time has now been interrupted. So, Penelope was working on her homework for a prolonged period of time, and then the doorbell rang and interrupted her.
