I was walking down a dark street one evening I heard screams coming from behind the bushes．( )A．whenB．beforeC．untilD．while 题目和参考答案——青夏教育精英家教网——

题目内容

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

A．

when

B．

before

C．

until

D．

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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This decline in vigour with the passing of time is called ageing．It is one of the most unpleasant discoveries which we all make that we must decline in this way，that if we escape wars，accidents and disease we shall eventually"die of old age"，and that this happens at a rate which differs little from person to person，so that there are heavy odds in favor of our dying between the ages of sixty-five and eighty．Some of us will die sooner，a few will live longer----on into a ninth or tenth decade．But the chances are against it，and there is a virtual limit on how long we can hope to remain alive，however lucky and physically strong we are．
Normal people tend to forget this process unless and until they are reminded of it．We are so familiar with the fact that man ages，that people have for years assumed that the process of losing vigour with time，of becoming more likely to die the older we get，was something self-evident，like the cooling of a hot kettle or the wearing-out of a pair of shoes．They have also assumed that all animals，and probably other organisms such as trees，or even the universe itself，must in the nature of things"wear out"．
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