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单项选择题

Which statement is true?()

    A.The output could be 5-1,6-1,6-2,5-2
    B.The output could be 6-1,6-2,5-1,5-2
    C.The output could be 6-1,5-2,6-2,5-1
    D.The output could be 6-1,6-2,5-1,7-1

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