Из предложенных вариантов выберите видо-временную форму страдательного залога:
Past Simple
A variety of tubes for specialized functions were designed by scientists.
Выберите один ответ:
Past Continuous
Past Perfect
Present Perfect
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Из предложенных вариантов выберите видо-временную форму страдательного залога:
Past Simple
A variety of tubes for specialized functions were designed by scientists.
Выберите один ответ:
Past Continuous
Past Perfect
Present Perfect
Past Simple