5．There is still a long way to go _____ the above questions could be answered．（　�。�
A．onceB．whenC．afterD．before

分析 在上面的問題得到回答之前仍然有很長的路要走．

解答 答案：D．根據(jù)選項 once一旦，when當(dāng)…時，after在…后，before在…前，再結(jié)合句意在上面的問題得到回答之前仍然有很長的路要走．，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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