Вопрос:

While Aaron was studying in his room, his friends swam in the pool. (study, swim)

Ответ:

В этом предложении нужно использовать Past Continuous для описания двух действий, которые происходили одновременно в прошлом.

While Aaron was studying in his room, his friends were swimming in the pool.

Ответ: was studying; were swimming

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