In summer, food will go bad quickly ________ we put it into a fridge.

A. if B. unless C. as soon as D. while

B 【解析】 句意：夏天，除非我們把食物放進冰箱里，否則食物很快就會變壞。A. if如果；B. unless除非；C. as soon as一……就；D. while正當……的時候。根據(jù)生活常識，在夏天只有放在冰箱里的食物才能保證不變質(zhì)，unless除非，如果不，相當于if not，引導條件狀語從句，故答案為B。
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