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МатематикаВопрос:
15. I (know) about the problem for months, but I (not / find) a solution yet.
Ответ:
Краткое пояснение: Используем Present Perfect Continuous, так как действие началось в прошлом и продолжается до сих пор, и Present Perfect, так как результат важен на данный момент.
Ответ
I have known about the problem for months, but I haven't found a solution yet.Перевод
Я знаю об этой проблеме уже несколько месяцев, но я еще не нашел решения.Ответ: have known, haven't found
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