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Families have also（ ）changes these years.More families consist of one‐parent households or two working parents;consequently,children are likely to have less supervision at home than was common in the traditional family structure.

单选题
Families have also（ ）changes these years.More families consist of one‐parent households or two working parents;consequently,children are likely to have less supervision at home than was common in the traditional family structure.

Asurvived

Bnoticed

Cundertaken

Dexperienced

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