【題目】Milk quickly goes bad _______ it is put into the fridge.

A. ifB. unlessC. whetherD. until

【答案】B

【解析】

句意：牛奶很快就會(huì)變質(zhì)，除非把它放在冰箱里。If假如，引導(dǎo)條件狀語從句；unless 除非，如果不，引導(dǎo)條件狀語從句；whether是否，引導(dǎo)賓語從句；until直到，引導(dǎo)時(shí)間狀語從句。根據(jù)句意，故選B。

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