When were the participants of the conference demonstrated new methods of investigation? When new methods of investigation were demonstrated to the participants of the conference? When were new methods of investigation demonstrated to the participants of the conference?
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Choose the correct answer.

  • When were the participants of the conference demonstrated new methods of investigation?
  • When new methods of investigation were demonstrated to the participants of the conference?
  • When were new methods of investigation demonstrated to the participants of the conference?

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