The American Civil War lasted four years ________ the North won in the end．
A.afterB.whenC.beforeD.then在线课程C
解析：
句意是：美国独立战争持续了四年，最后以北方胜利而告终．在时间顺序上，“战争持续四年”在“北方胜利”之前，所以要用从属连词before．需要注意，then是副词，不能连接主从复合句．
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