He had to be called two or three times he would switch off the computer to his dinner．( )A．untilB．beforeC．whenD．as 题目和参考答案——青夏教育精英家教网—

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15．He had to be called two or three times ______ he would switch off the computer to his dinner．（　　）

A．

until

B．

before

C．

when

D．

分析他必须被喊两到三次，他才会关掉电脑来吃晚餐．

解答答案B．
until"直到；before"在…之前；才…"；when"在…时候"；as"随着"．这四个词均可以引导时间状语从句．before用于肯定句中强调主句所表达的时间，距离长，或花费的精力大，译成"才"，结合句子所表达的意思可知答案选B．

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．before用于肯定句中强调主句所表达的时间，距离长，或花费的精力大，译成"才"．如：
    We had sailed four days and four nights before we saw lands．
    我们航行了四天四夜才看到陆地．
    We waited a long time before the train arrived．
    我们等了很长时间火车才到．

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