单选题:During 1930s,why did the percentage of 17yearold who graduat

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题目内容:
During 1930s,why did the percentage of 17yearold who graduated from high school jumped greatly? A.Because they believed high school education is necessary.
B.Because they couldn’t find jobs and they had no beaer choices.
C.Because the cost of going to school was reduced.
D.Because they beHeved high school education could help them make more money inthe future.

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