This observation has been vs has been intensively investigated by many

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this observation has been is the most popular phrase on the web. 

has been intensively investigated by many

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this observation has been

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Some examples and use cases from the internet:

  • The photochemistry of nitrosyl halides has been intensively investigated by many workers; especial interest has been concentrated on the mechanisms of ...
  • 1 negatively ...
  • puter science, mathematical statistics, ...
  • recognition that it has been intensively investigated by many scientists and engineers from different domains such as com
  • 1 has been intensively investigated by many researchers. Engelman et al (1998b) have demonstrated that caveolin
  • The problem of classification is so fundamental that it has been intensively investigated by many researchers from different domains. In this paper, we present a ...
  • The function of caveolin
  • Mar 4, 2015 ... If you are only referring to one observation, you won't need "following": This observation has been addressed. owlman5, Mar 4, 2015.
  • Aug 24, 2015 ... Duns has shown with countless examples how this is the case and I invite you to try it yourself. This observation has been, somewhat playfully ...
  • A new UPDATE for this Observation has been issued September 30, 2014 at 9: 00PM EST. Click on the additional link below to read this important update.
  • this observation has been made clear. 4 marks – The suggestion is appropriate, clear and detailed and there is a clear link this observation. [4]. Section B Total.

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