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МатематикаВопрос:
17. I ................................. (know) Jessica for many years before we started working together.
Ответ:
17. I had known Jessica for many years before we started working together.
В данном предложении используется Past Perfect, так как действие (знать Джессику) продолжалось до определенного момента в прошлом (начала совместной работы).
Ответ: had known
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