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МатематикаВопрос:
5. How long ........ on this project? a have they been working b have they worked
Ответ:
Правильный ответ: a) have they been working.
Объяснение: Здесь используется Present Perfect Continuous, чтобы спросить, как долго они работают над проектом. Акцент делается на продолжительности действия.
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