consider是动词,在这里是被动句的用法.每天吃一颗苹果被认为是健康的.并不是作为形容词使用,而是动词的ed形式.
因为healthful不是用来修饰consider的,而是用来修饰每天吃一颗苹果的.
改成主动句是：people consider it healthful to eat an apple a day.
eating an apple a day is considered healthful.
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