Choose the correct variant of the construction. She ___ her homework when the lights went out.
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Верный ответ
- Dwas doing
Разбор
The sentence describes an action in progress in the past that was interrupted by another past action (the lights went out). For this we use the Past Continuous construction: was/were + verb-ing. So the correct variant is «was doing». «has done» is Present Perfect, «does» is Present Simple, and «is doing» is Present Continuous, so they do not fit a past situation.