It has been proved vs it was proved

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it has been proved is the most popular phrase on the web. 

it was proved

1942,000 results on the web

it has been proved

15,380,000 results on the web

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Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • Though it was proved that I had an alibi and you later withdrew the accusation.
  • Of course, it was proved beyond any doubt... that Esme Cordelia Hoggett was not a felon.
  • circumvention measure in 1997 it was proved that the remedial effect of the duty on Chinese bicycles was undermined in terms of sales prices, and dumping existed.
  • The accused has confessed because it was proved as soon as we got the letter.
  • It is, however, recalled that during the investigation leading to the anti
  • This sentence was included in Directive 2002/73, as it was proved by experience and research that a serious reason of the reluctance of women to have recourse to courts or even to competent administrative authorities is the lack of evidence.
  • Though it was proved that I had an alibi and you later withdrew the accusation.
  • If, therefore, it was proved that a dump did exist at this spot, a causal connection could be established between the workers' deaths and the presence of asbestos.
  • It has been proved that a dedicated few can hold a majority to ransom.
  • Immunological testing may not be used if the animals have been vaccinated unless it has been proved the vaccine used does not interfere with the testing method applied.
  • It has been proved
  • Regarding things from the psychological point of view, it has been proved that tough punishments have never had a corrective role, but they generate hatred, violence, and a wish for revenge against fellow people and authorities.
  • that it is, in particular, excessive speed, incomplete and outdated training and a certain lack of concern behind the wheel which are at the basis of this new human scourge.
  • and the statistics are extremely clear in this regard
  • Indeed, it has been proved that this set of operations causes the animals greater stress and suffering than any other farming practice.
  • "level of assurance" means the degree to which the verifier is confident in the verification conclusions that it has been proved whether or not the information reported for an installation taken as a whole is free from material misstatement;

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