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9.In summer,food goes bad easily ___ it is put in the refrigerator.A until B unless C if D when

分类: 作业答案 • 2021-12-28 10:35:45

问题描述：

9.In summer,food goes bad easily ___ it is put in the refrigerator.A until B unless C if D when

答

B
unless如果不；引导了条件状语从句