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МатематикаВопрос:
3. We had struggled / had been struggling to understand professor Hopkin's lecture before we finally gave up.
Ответ:
3. We had been struggling to understand professor Hopkin's lecture before we finally gave up.
В данном предложении had been struggling показывает, что действие (пытались понять) продолжалось в течение определенного времени до того, как мы сдались.
Ответ: had been struggling
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