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    • Member Info
      • Native Language:
      • Polish
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      • Poland
      • Current Location:
      • Poland

    • Join Date: Nov 2012
    • Posts: 170
    #1

    "in" or "on"

    Which one is correct:
    a) He is an expert on that issue.
    b) He is an expert in that issue.
    ?

    • Member Info
      • Native Language:
      • English
      • Home Country:
      • United States
      • Current Location:
      • United States

    • Join Date: Mar 2009
    • Posts: 3,505
    #2

    Re: "in" or "on"

    On.

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