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МатематикаВопрос:
25. He ... (study) the environment for over ten years.
Ответ:
He has studied the environment for over ten years.
Объяснение: Здесь используется Present Perfect, чтобы показать, что он изучал окружающую среду в течение определенного периода времени, и это действие завершено. Форма этого времени: have/has + V3 (past participle).
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