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    Question

    Read the sentence to find out whether there is any

    grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer. If there is ‘No error’, the answer is (5). (Ignore errors of punctuation, if any). The government has announced new guidelines (A)/ to improve air quality in urban areas, but (B)/ the effectiveness of these measures remains to (C)/ be seen as implementation challenges persists (D) No error (E) 
    A A Correct Answer Incorrect Answer
    B B Correct Answer Incorrect Answer
    C C Correct Answer Incorrect Answer
    D D Correct Answer Incorrect Answer
    E No error Correct Answer Incorrect Answer

    Solution

    In (D), replace "persists" with "persist." The subject of the sentence is "implementation challenges," which is plural. Therefore, the verb should also be in the plural form, i.e., "persist."  The sentence would then read: "The government has announced new guidelines to improve air quality in urban areas, but the effectiveness of these measures remains to be seen as implementation challenges persist." Therefore, (D) is the correct answer. 

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