单选题:During1930s,whydidthepercentageof17-year-oldswhograduatedfro

题目内容:
During1930s,whydidthepercentageof17-year-oldswhograduatedfromhighschooljumpedgreatly? A.Becausetheybelievedhighschooleducationisnecessary.
B.Becausetheycouldn'tfindjobsandtheyhadnobetterchoices.
C.Becausethecostofgoingtoschoolwasreduced.
D.Becausetheybelievedhighschooleducationcouldhelpthemmakemoremoneyinthefuture.

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