【题目】It was as a result of his carelessness _______ a serious fire broke out during the night.
A.whenB.thatC.beforeD.since
在线课程【答案】B
【解析】
考查强调句式。句意：那晚突发大火是他疏忽的结果。通过分析句子成分可知，It is...that...是强调句式，其中asaresultofhiscarelessness在句中作原因状语，主句是a serious fire broke out during the night ，符合强调句结构。故选B项。