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(huì)議上，所有的國家都被號(hào)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(xiàng) when當(dāng)…時(shí)，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(gè)引導(dǎo)時(shí)間狀語從句的連接詞，故D正確

點(diǎn)評 本題考查時(shí)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(shí)要注意其他選項(xiàng)的意思，

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