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Вопрос:
8. He ______ it for an hour before I came. a) have been doing b) had been done c) had been doing d) did
Ответ:
Правильный ответ: c) had been doing.
Объяснение: Действие продолжалось в течение определенного времени до другого действия в прошлом (before I came), поэтому используется Past Perfect Continuous. Правильный вариант - had been doing.
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