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Вопрос:
8. We ... for you for half an hour. a) have been waiting b) have been waited c) have waited
Ответ:
Правильный ответ: a) have been waiting.
Объяснение: Present Perfect Continuous, так как действие началось в прошлом (полчаса назад) и продолжается до настоящего момента. Подчеркиваем длительность ожидания.
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