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МатематикаВопрос:
4. They (buld) that bridge for two years before they (build) it.
Ответ:
Краткое пояснение: Использовать Past Perfect Continuous, так как действие длилось до определенного момента в прошлом.
Ответ (EN)
They had been building that bridge for two years before they finished it.
Перевод (RU)
Они строили этот мост два года, прежде чем закончили его.
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