Which of the following is a usage of the past continuous tense?
- Action in progress at a specific time in the past. *(Correct)
- A completed past action
- An action that was completed before a past time.
- An action that began in the past and continues up until the present time.
I got this question wrong and selected 4. Can someone explain why the correct answer is 1? To me, it doesn't seem right since we can write non-specific sentences like "he was cooking".