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Milk will turn sour soon on hot days ______ it is stored in the refrigerator.
A.sinceB.until
C.becauseD.unless
D

试题分析:句意:牛奶在热天可能会变酸,除非在冰箱里面储存。这里使用连词unless“除非,如果不”,since“自从”,because“因为”,until“直到”,所以选D。
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