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    2．I was walking down a dark street one evening______I heard screams coming from　behind the bushes．（　　）
    A．whenB．beforeC．untilD．while

    分析 一天晚上我正走在黑暗的大街上，突然我听到从灌木丛后面传出的尖叫声．

    解答 答案A．
    when"在…时候"；before"在…之前；才…"；until"直到"；while表示"当…的时候"．这四个词都可以引导时间状语从句，但是只有when可以用于"be　doing　sth．when…"结构中，表示"正在做某事突然…"，故答案选A．

    点评 本题考查从属连词的用法．连词的用法辨析，要注意分析主从句之间的逻辑关系，再确定相应的连词，同时注意不同的连词的语义及用法区别．

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