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МатематикаВопрос:
21 We....... half the rubbish on the beach by the time Jeff arrived. A have cleaned up B had cleaned up C had been cleaning up
Ответ:
Решение:
- Анализ: Предложение описывает действие, которое было завершено к определенному моменту в прошлом ('by the time Jeff arrived' - к тому времени, как Джефф прибыл). Это указывает на использование Past Perfect Tense.
- Выбор: Вариант A ('have cleaned up') - Present Perfect, не подходит. Вариант C ('had been cleaning up') - Past Perfect Continuous, используется для длительного действия, которое продолжалось до момента в прошлом, но здесь акцент на завершенности. Вариант B ('had cleaned up') - Past Perfect Simple, идеально подходит для завершенного действия к моменту в прошлом.
Ответ: had cleaned up
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