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    Question

    In each of the following questions, a sentence is given

    with four parts marked (a), (b), (c), and (d). One of these parts may contain an error. Identify the part that contains the error. If the sentence is grammatically correct and free from error, select (e) No error as the answer. Early diagnosis and timely intervention (a) contributes significantly to improving (b) patient outcomes by reducing complications (c) and enhancing the overall effectiveness of medical treatment. (d) No error (e)
    A b Correct Answer Incorrect Answer
    B d Correct Answer Incorrect Answer
    C a Correct Answer Incorrect Answer
    D c Correct Answer Incorrect Answer
    E e Correct Answer Incorrect Answer

    Solution

    Early diagnosis and timely intervention, This is a compound subject joined by and, so it is plural. The verb must be plural to agree with the compound subject, that is contribute . 

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