Контрольные задания > B. Complete using the correct passive form of the verbs in brackets. 6. Radio waves ....... (discover) by Marconi.
Вопрос:
B. Complete using the correct passive form of the verbs in brackets. 6. Radio waves ....... (discover) by Marconi.
Ответ:
Radio waves were discovered by Marconi.
Explanation: The correct passive form of 'discover' is 'were discovered'. It's in the simple past passive, because we know who did the action.