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Computers: preposições de tempo (A2)

The first electronic computers were built ___ the 1940s. They were enormous machines that filled whole rooms and used a huge amount of electricity. Today a small phone is far more powerful than those early computers. Engineers keep making chips smaller and cheaper, and many students now write their own programs at home. Some of them write their first small game before leaving school.

Fonte: English for ALL (texto original).

Assinale a alternativa que completa corretamente a lacuna do texto.

  1. A) on
  2. B) at
  3. C) in
  4. D) for
  5. E) since
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Resposta correta: C

Com décadas, séculos, anos, meses e estações do ano usamos a preposição in, como em in the 1940s. A preposição on serve para dias e datas específicas, e at aparece com horas e expressões como at night, por isso ambas estão erradas. As opções for e since indicam duração e ponto de partida e não combinam com o passado simples were built.

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