Choose the correct variant of the construction.
I ___ my keys. I can't find them anywhere.
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Верный ответ
- Ahave lost
Разбор
The sentence describes a past action with a present result: the keys are still missing now. For this meaning we use the Present Perfect, so the correct construction is "have lost". "lost" would only name a past event without a link to the present. "was losing" shows an action in progress in the past. "had been lost" is a Past Perfect Passive form and does not fit the meaning.