if -------in the fridge,the fruit can remian fresh for more than a week

问题描述:

if -------in the fridge,the fruit can remian fresh for more than a week
A keeping B be kept C kept D to koop
但IF不是连词吗,是连词不就要用谓语动词了吗?所以我选的B
求指教

实际上就是一个过去分词短语表被动,是一个条件状语,可以直接把if省略