【題目】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】

試題分析：句意為：夏天牛奶如果不放進(jìn)冰箱，就很容易變壞。though：盡管，unless：除非、如果不， because：因?yàn)椋琽nce：一旦。根據(jù)語境可知應(yīng)選B。

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