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    Question

    Select the option that expresses the given sentence in

    passive voice. A child could understand his theory.
    A His theory is being understood by a child. Correct Answer Incorrect Answer
    B His theory was understood by a child. Correct Answer Incorrect Answer
    C His theory could be understood by a child. Correct Answer Incorrect Answer
    D His theory can be understood by a child. Correct Answer Incorrect Answer

    Solution

    In passive voice, "could" remains as a modal verb followed by "be understood." "His theory" becomes the subject.

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