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МатематикаВопрос:
I've been writing / have written this letter for an hour.
Ответ:
Обоснование: Указание времени 'for an hour' (в течение часа) подчеркивает длительность процесса написания письма. Действие продолжалось в течение этого часа. Поэтому используется Present Perfect Continuous: 'I've been writing'.
Ответ: I've been writing
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