After graduating from college, I took some time off to go traveling, turned out to be a wise decision.
A. that
B. which
C. when
D. where
网友回答
A. that
(答案→)B. which
C. when
D. where
解析：考查定语从句。关系代词which可以指代一句话的内容在句中做主语，引导非限制性定语从句。句意：大学毕业以后，我花了时间去旅游，这件事情被注明是非常明智的选择。That不能引导非限制性定语从句。CD两项不能在句中做主语。故B正确。