单选题：Adult education has been made necessary by __________.

题目分类：卫生类
题目类型：单选题
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题目内容：

Adult education has been made necessary by __________. 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

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答案解析：

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第49题__________

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