Milk will turn sour soon on hot days ______ it is stored in the refrigerator．A．s
题型：不详难度：来源：
Milk will turn sour soon on hot days ______ it is stored in the refrigerator．| A．since | B．until | | C．because | D．unless |
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答案
| 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。 |
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