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    Question

    Read the  sentence to find out whether there is any

    part with grammatical error in it.  Although to our knowledge (1)/there exists no empirical data to confirm (2)/the disincentive hypothesis, there is (3)/none which refutes it either (4).
    A 1 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    With Superlative Degree Adjective, only, none, all etc., as Relative Pronoun we use that and not which or who. Although to our knowledge there exists no empirical data to confirm the disincentive hypothesis, there is none that refutes it either.

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