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    Question

    When he looked back, (A)/the professor understood that

    (B)/he spent most of his life to teach (C)/at the middle school (D). Read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark ‘No error’ as your answer (Ignore the errors of punctuation, if any).
    A When he looked back Correct Answer Incorrect Answer
    B the professor understood that Correct Answer Incorrect Answer
    C he spent most of his life to teach Correct Answer Incorrect Answer
    D at the middle school Correct Answer Incorrect Answer
    E No error Correct Answer Incorrect Answer

    Solution

    Here, instead of ‘to teach’, the gerund ‘teaching’ should be u sed. When he looked back, the professor understood that he spent most of his life teaching at the middle school.

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