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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| A．until | B．while | C．as | D．when |
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| A．so that | B．but that | C．now that | D．in that |
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| A．since | B．if | C．as | D．while |
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| A．Whether | B．What | C．How | D．Where |
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| A．in case | B．so that | C．in order | D．as if |
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| A．whom | B．who |
| C．whomever | D．whoever |
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