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

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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

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

9.In summer,food goes bad easily ___ it is put in the refrigerator.A until B unless C if D when
B
unless如果不;引导了条件状语从句

b! 夏天食物很容易变腐,除非放冰箱里。