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Milk quickly goes bad in summer        it is in a fridge(冰箱).
A.ifB.becauseC.unless D.when
C

试题分析:根据题干,本句的意思是“在夏天,除非将牛奶放进冰箱,否则它会很快变质。”“除非”是unless。其他选项都不符合题意。所以本题选C。
点评:本题的关键在于先弄懂句子的意思,然后选择合适的引导词,unless是“除非”“如果……不”的意思,所以也等于if……not。
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