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问题详情：完形填空阅读下面短文，从每小题A、B、C、D四个选项中选出能填入相应空白处的最佳*。IntheUnitedStates,childrenstartschoolwhentheyarefiveyearsold.Insomestatestheymuststayinschool 1 theyaresixteen:Mo...