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    4．Why do you turn to me for help_____ you can easily work out the problem independently？（　　）
    A．untilB．whenC．afterD．unless

    分析 既然你自己能够很容易地解出这个问题，为什么还要求助于我呢？

    解答 答案：B 本句中when在引导时间状语从句，可译为"既然"，相当于"since，as等"，主句为一个特殊疑问句"你为什么向我求助呢？"而从句的意思是"你自己就可以很容易地解出这个问题"，可知使用when可以使句子前后合乎逻辑，故答案为A．其余三个选项在引导状语从句时意思常为：until"直到"，after"在…之后"，unless"除非"，用在本句中都不合句意，排除．

    点评 解含有状语从句的复合句时，关键是弄清主从句的关系，然后根据句意选择合适的连词．

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