Choose the correct variant of the construction.
I ___ my 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". "did" shows a completed action, "am doing" is the present tense, and "have done" is the Present Perfect, which does not fit the past time marker "when the lights went out".