Multiple Choice Questions on Air pollution caused by industrial effluents has been studied A for years but only recently has B th........... for English All Exams Zone Preparation

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Multiple Choice Questions

Air pollution caused by industrial effluents has been studied A for years but only recently has B th...........

English ( Master) Tenses
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    Air pollution caused by industrial effluents has been studied (A)/ for years, but only recently has (B)/ the harmful effects of noise pollution become known(C)/. No error.(D)

    a

    Incorrect Answer

    b

    Correct Answer

    c

    Incorrect Answer

    d

    Incorrect Answer
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    Explanation:
    use 'have' instead of 'has' as harmful effects of noise pollution is plural.

    By: SONAM SHEORAN
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