In summer milk will quickly go bad_____ it is put into a fridge.
A．thoughB．unlessC．becauseD．once
B

試題分析：句意:在夏天，牛奶很快就會變質(zhì)，除非把它放在冰箱里。though雖然，盡管，引導(dǎo)讓步狀語從句；unless 除非，如果不，引導(dǎo)條件狀語從句；because 因為，引導(dǎo)原因狀語從句；once曾經(jīng)，一旦，一次。根據(jù)句意可知選B。
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