Давайте разберем предложения и откроем скобки, используя правильные времена: Past Indefinite и Past Perfect.
When the delegation arrived at the conference, the journalists already had taken their places in the hall.
When the secretary got the fax, the boss had gone home.
The Chinese invented paper earlier than the Europeans.
We were writing the article when Mike brought new information.
The city learned about a new exhibition from morning newspapers.
I had read the book before I watched the film.
She understood that she never had seen such a beautiful picture before.
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