In hot summer, milk quickly turns sour it is refrigerated.A.whileB.ifC.untilD.unless
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D解析试题分析: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”考点:考查连词
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