题目内容

The fire started on the second floor and it wasn't long ______ the whole building was burned down.
A.whileB.when C.after D.before
D

试题分析:考查连词 句意为:大火在第二层楼开始蔓延,不久整栋大楼就被烧毁了。it isn’t/wasn’t long before 结构意为“不久…就…”;It +be+时间段+before结构意为“...之后才... ”
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