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        1. The fire started on the second floor and it wasn't long ______ the whole building was burned down.
          A.whileB.when C.a(chǎn)fter D.before
          D

          試題分析:考查連詞 句意為:大火在第二層樓開始蔓延,不久整棟大樓就被燒毀了。it isn’t/wasn’t long before 結(jié)構(gòu)意為“不久…就…”;It +be+時間段+before結(jié)構(gòu)意為“...之后才... ”
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