Were introduced vs have been introduced

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Looking on the internet deeply has found these results:

were introduced is the most popular phrase on the web. 

have been introduced

1928,000 results on the web

were introduced

12,120,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • Up to 26,000 plants have been introduced into New Zealand. This list is a few of the more common and more invasive species. Gorse from Scotland; Common ...
  • Jul 25, 2014 ... I don't know that we have been introduced. Does it mean the same thing as: I don' t think we've been introduced. meaning word
  • Some species have been introduced intentionally to combat pests. They are called biocontrols and may be regarded as beneficial as an alternative to pesticides ...
  • Aug 3, 2015 ... 364 bills that have been introduced in Congress, ranked by acronym quality. The inside track on Washington politics. Be the first to know about ...
  • choice ...
  • Four Standard Time Zones for the Continental U.S. Were Introduced November 18, 1883. Before the U.S. had time zones, how did people traveling across the ...
  • Jul 19, 2015 ... TIL When trains were introduced in the U.S, many people believed that that “ women's bodies were not designed to go at 50 miles an hour,” and ...
  • In Alaska, foxes were introduced to many islands to create new populations for the fur trade. About twenty species of African and European dung beetles have ...
  • In addition to the diseases mentioned above, many species of organisms were introduced to new habitats on the other side of the world accidentally or ...

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