单选题：Some adults want to learn__________.

题目分类：理工类
题目类型：单选题
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题目内容：

Some adults want to learn__________. 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

参考答案：

答案解析：

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分类：理工类题型：单选题