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МатематикаВопрос:
3 perform a Dr Stephens ..... an experiment while his students were watching him.
Ответ:
3 perform
a Dr Stephens was performing an experiment while his students were watching him.
В данном предложении нужно использовать Past Continuous, так как действие «was performing an experiment» происходило в определенный момент в прошлом, когда — «his students were watching him.»
Ответ: was performing
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