what was your sweater made of为什么不是made from?

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what was your sweater made of
为什么不是made from?

be made of 是可以看出原材料的,例:The sweater was made of woollen.
毛衣是羊毛作的(可以看出的)
be made from是不可以看出原材料的,例/:The paper is made from wood
纸是树木作的(看不出来的)

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be made of 是可以看出原材料的