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МатематикаВопрос:
9. We (try) to find tickets for the concert for three weeks.
Ответ:
9. We **have been trying** to find tickets for the concert for three weeks.
Объяснение: Используется Present Perfect Continuous, так как действие началось в прошлом и продолжается до настоящего момента. Форма Present Perfect Continuous: have/has been + verb-ing. 'We' требует 'have'.
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