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With a modal verb: This bottle of milk has turned sour. You have put it in the refrigerator.
【正确答案】：This bottle of milk has turned sour. You should have put it in the refrigerator.
【题目解析】：should have done sth 表示本应该做某事修改后的句意为：这瓶牛奶已经变酸了，你本应该把它放进冰箱的