Adult education has been made necessary______.A.b
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Adult education has been made necessary______.
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：A
由文章第三段中“Great economic and social changes were taking place”及“These and other factors produced a need for further education and reeducation of adults.”可知，由于社会和经济的巨大变革，成年人有必要进行继续教育和再教育。故选A。