题目内容

自1854年以来，NBER已经确认了________。

A. 82个完整的经济周期
B. 33次经济增长和25次经济衰退
C. 33个完整的经济周期
D. 25次经济增长和33次经济衰退
E. 17个完整的经济周期

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