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    精英家教网 > 高中英语 > 题目详情
    In hot summer, milk quickly turns sour       it is refrigerated.
    A．whileB．ifC．untilD．unless
    D

    试题分析：考查连词，A. while当…时候B. if如果C. until直到…D. unless除非，引导条件状语从句，句子意思“在炎热的夏季，牛奶很快变酸除非被冷藏”
    点评：连词是高考常考内容，判断从句中用哪个连词，需要记住连词的用法，需要考生平时多练习，本题主要考查unless的用法，要求考生掌握好它的用法
    即学即练：It will be quite a long time _______ she is back again, so don’t be too cross with her.
    A. before                   B. since                C.that          D. until
    选A
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