IntheUnitedS的精選

問題詳情：完形填空閲讀下面短文，從每小題A、B、C、D四個選項中選出能填入相應空白處的最佳*。IntheUnitedStates,childrenstartschoolwhentheyarefiveyearsold.Insomestatestheymuststayinschool 1 theyaresixteen:Mo...