Milk will turn sour soon on hot days it is stored in the refrigerator．( )A．sinceB．untilC．becauseD．unless 题目和参考答案——青夏教育精英家教网——

题目内容

17．Milk will turn sour soon on hot days ______ it is stored in the refrigerator．（　　）

A．

since

B．

until

C．

because

D．

unless

分析牛奶在热天可能会变酸，除非在冰箱里面储存．

解答答案：D．
牛奶变质是没有存放在冰箱里造成的，根据前后两个句子的含义可知，用unless连接，表示"除非"；unless连接条件状语从句，相当于if not；since和until引导时间状语从句；because引导原因状语从句；故选D．

点评 unless是从属连词，引导条件状语从句，含有否定意义，相当于if条件状语从句的否定形式．所以unless=if not．
如本句可改为Milk will turn sour soon on hot days if is not stored in the refrigerator

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