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МатематикаВопрос:
c Two weeks ago Dr Stephens ..... an experiment with the help of some university students.
Ответ:
c Two weeks ago Dr Stephens performed an experiment with the help of some university students.
В данном предложении нужно использовать Past Simple, так как действие «performed an experiment» произошло в прошлом — «Two weeks ago».
Ответ: performed
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