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МатематикаВопрос:
2. How long ................................. (you / wait) before Adam turned up?
Ответ:
2. How long had you been waiting before Adam turned up?
В данном предложении используется Past Perfect Continuous, так как вопрос задается о продолжительности действия (ожидания) до определенного момента в прошлом (прихода Адама).
Ответ: had you been waiting
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