Сопоставление предложений:
- 1. The Sun is bought by about 3.7 million people every day. — c. 3.7 million people buy The Sun every day.
- 2. The printing press was invented by Gutenberg in 1447. — a. Gutenberg invented the printing press in 1447.
- 3. Thousands of newspaper websites have been created since 1990. — b. People have created thousands of newspaper websites since 1990.
Грамматическое правило:
Ответ: Мы используем активный/пассивный залог, когда нас больше интересует действие, чем человек, который его совершает.