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МатематикаВопрос:
I have written / have been writing letters for weeks
Ответ:
Обоснование: Указание времени 'for weeks' (недели напролет) подчеркивает длительность процесса написания писем. Действие продолжалось в течение длительного периода. Поэтому используется Present Perfect Continuous: 'have been writing'.
Ответ: have been writing
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