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МатематикаВопрос:
They (to build) this hospital for two years before they (to open) it.
Ответ:
Краткое пояснение: Используем Past Perfect Continuous для длительного действия, которое происходило до другого действия в прошлом (строительство до открытия).
Пошаговое решение:
- Глагол 'to build' в Past Perfect Continuous для 'they' будет 'had been building'.
- Глагол 'to open' в Past Simple для 'they' будет 'opened'.
Ответ: They had been building this hospital for two years before they opened it.
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