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15.At the Copenhagen conference,all the countries were called on to do all they could to control greenhouse gas emissions     it was too late.(  )
A.whenB.afterC.untilD.before

分析 在哥本哈根会议上,所有的国家都被号召在太迟之前做他们能做的一切来控制温室气体排放.

解答 答案:D.根据选项 when当…时,after在…后,until直到…,before在…前再结合句意,在太迟之前做他们能做的一切来控制温室气体排放,可知此处缺少了一个引导时间状语从句的连接词,故D正确

点评 本题考查时间状语从句的连接词,在充分分析句型再结合语义的基础上便能选出正确答案,同时要注意其他选项的意思,

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