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МатематикаВопрос:
9. Doctor Fleming discovered penicillin while he (study) influer
Ответ:
9. Doctor Fleming discovered penicillin while he was studying influenza.
Пояснение: Past Continuous показывает действие, которое происходило в определенный период времени в прошлом (while he was studying), когда произошло другое действие (Doctor Fleming discovered penicillin).
Ответ: Doctor Fleming discovered penicillin while he was studying influenza.
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