A Dan bid farewell to his parents and went to stay by the Yellow River in the evening ("my parents go" and "by the Yellow River" are not parallel rhetorical correspondences, and "father and mother" and "Yellow River" are not corresponding in a strict sense. , and "go" and "bian" are not even corresponding, and do not conform to the characteristics of duality. )
The three answers B, C, and D all contrast neatly and are dual sentences.
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