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 在哥本哈根會議上，所有的國家都被號召在太遲之前做他們能做的一切來控制溫室氣體排放．

解答 答案：D．根據(jù)選項 when當(dāng)…時，after在…后，until直到…，before在…前再結(jié)合句意，在太遲之前做他們能做的一切來控制溫室氣體排放，可知此處缺少了一個引導(dǎo)時間狀語從句的連接詞，故D正確

點評 本題考查時間狀語從句的連接詞，在充分分析句型再結(jié)合語義的基礎(chǔ)上便能選出正確答案，同時要注意其他選項的意思，

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