The bed ____wood ____three separate parts.A.is made from; is made up ofB.made by; is made withC.made of; is made ofD.is made up of; is made by
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C解析be made of和be made from都表示“由……制成”，前者可以看到制造材料，后者则看不出材料。制床用的材料是可见的。be made up of表示“由……组成”。句中made of wood是过去分词短语作定语，修饰the bed.