题目内容
Milk will turn sour soon on hot days ______ it is stored in the refrigerator．
A．since B．until
C．because D．unless
D
【解析】
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。
考点：考查连词辨析
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