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    【题目】In summer milk quickly go bad _____it is put into a fridge.

    A. though B. unless C. because D. Once

    【答案】B

    【解析】

    试题分析：句意为：夏天牛奶如果不放进冰箱，就很容易变坏。though：尽管，unless：除非、如果不， because：因为，once：一旦。根据语境可知应选B。

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