如果没有结果状语中的today ,答案便是causing,因为那便是相对谓语snowed 来说的了
此句因为有today,那么cause 便受这个时间状语的限制,而相对today"今天”来讲“the traffic problem ”已成事实,故用完成式 having caused
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it snowed heavily last night ,thus （having caused ）the traff
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