In warm weather,fruit and meat ____ long.-A.don't keep B.can't be kept为什么选A不选B?

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In warm weather,fruit and meat ____ long.-A.don't keep B.can't be kept
为什么选A不选B?

Keep long是长时间保存,固定的用法,而且这里应用主动,也因为是习惯问题,不用被动,就如同:The meal smells well一样