132Some adults want to learn__________. 查看材料A.by socia8895

Some adults want to learn__________. 查看材料 A.by social and economic changes B.guided self-study and correspondence courses C.by studying together with children D.what they did not manage to learn earlier E.dates back to the eighteenth century F.mass production 请帮忙给出正确答案和分析，谢谢！