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

試題分析：句意：牛奶在熱天可能會變酸，除非在冰箱里面儲存。這里使用連詞unless“除非，如果不”，since“自從”，because“因為”，until“直到”，所以選D。
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