A. by social and economic changes B. guided self-study and correspondence courses C. by studying together with children D. what

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问题 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
Adult education has been made necessary______.

选项

答案A

解析 由文章第三段中“Great economic and social changes were taking place”及“These andother factors produced a need for further education and reeducation of adults.”可知,应选A。
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