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МатематикаВопрос:
19. Jane's tired. She (do) exercises all morning.
Ответ:
19. Jane's tired. She has been doing exercises all morning.
В данном предложении необходимо использовать Present Perfect Continuous, так как действие началось в прошлом и продолжалось в течение некоторого времени (все утро), и результат виден в настоящем (Джейн устала).
Ответ: has been doing
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