题目内容
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提问人：网友z*****n
发布时间：2022年4月6日 10:55
[单项选择题]
There has been no lack of theories on the cause of war. But we do lack theories that hold u...After collecting factual data about wars, the scholars devoted themselves to studying
A． the political and social conditions that have often led to war
B． democracies and autocracies
C． the effectiveness of wartime propaganda
D． what caused the actual outbreak of hostilities
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