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МатематикаВопрос:
24. John ... (try) to fix his computer for two hours before he decided to call a professional.
Ответ:
Здесь нужно использовать Past Perfect Continuous, чтобы показать, что действие (John trying) длилось в течение определенного времени до другого действия в прошлом (he decided).
Ответ: had been trying
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