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，突然我聽到從灌木叢后面?zhèn)鞒龅募饨新暎?/p>

解答 答案A．
when"在…時候"；before"在…之前；才…"；until"直到"；while表示"當…的時候"．這四個詞都可以引導時間狀語從句，但是只有when可以用于"be　doing　sth．when…"結構中，表示"正在做某事突然…"，故答案選A．

點評 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關系，再確定相應的連詞，同時注意不同的連詞的語義及用法區(qū)別．

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