besides 用于引出已提及事物之外的其他事物:Fruit will give you, besides enjoyment, a source of vitamins(水果不但好吃,而且富含维生素).
except 用来引出陈述中唯一不适用的事物、情形、人或想法:All of his body relaxed except his right hand(除了右手以外,他全身上下都放松了).
所以这里用except.“这扇窗户除了在夏天,其余时间都是关着的.”
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