Milk quickly goes bad in summer        it is in a fridge(冰箱).
A．ifB．becauseC．unless D．when
C

試題分析：根據(jù)題干，本句的意思是“在夏天，除非將牛奶放進(jìn)冰箱，否則它會很快變質(zhì)�！薄俺恰笔莡nless。其他選項都不符合題意。所以本題選C。
點評：本題的關(guān)鍵在于先弄懂句子的意思，然后選擇合適的引導(dǎo)詞，unless是“除非”“如果……不”的意思，所以也等于if……not。
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