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    #1

    Scientists made this discovery

    Scientists made this discovery years of extensive ..... .
    1. research
    2. searching
    3. investigation
    4. experiments

    I'd personally choose 1. Am I right?( Answer key: No.4)

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    #2

    Re: Scientists made this discovery

    Have you missed out the word 'after'?

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    #3

    Re: Scientists made this discovery

    No. It's a original test. However, I agree with you. After or through is needed here to complete a meaning!

  1. bhaisahab's Avatar
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    #4

    Re: Scientists made this discovery

    Quote Originally Posted by Freeguy View Post
    No. It's a original test. However, I agree with you. After or through is needed here to complete a meaning!
    Where are these tests from?

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    #5

    Re: Scientists made this discovery

    Iranian University Entrance Exams( It is called Concours in French)

  2. MikeNewYork's Avatar
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    #6

    Re: Scientists made this discovery

    Quote Originally Posted by Freeguy View Post
    Scientists made this discovery years of extensive ..... .
    1. research
    2. searching
    3. investigation
    4. experiments

    I'd personally choose 1. Am I right?( Answer key: No.4)
    I would choose 1, but 3 would be close.

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    #7

    Re: Scientists made this discovery

    It's a dodgy question, but I would choose 1 too.

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