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МатематикаВопрос:
5 How long ...... on this project? a have they been working b have they worked
Ответ:
a have they been working
Объяснение: 'Have they been working' спрашивает о продолжительности работы над проектом с акцентом на процесс. 'Have they worked' просто спрашивает, работали ли они над проектом.
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