We want to make clear the material____the machine is made.A.

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We want to make clear the material____the machine is made.A.which B.that C.of which D.
We want to make clear the material____the machine is made.
A.which B.that C.of which D.from which
选D,为什么?求详解

定语从句,要填的词做引导词,使用还原原则,还原之后得到的是
The machine is made from the material.
容易误选的是C项,be made of 和 be made from的区别是
be made of是指从合成物可以看出原材料的情况
而be made from看不出原材料.
原文用了material这样一个笼统的词,显然是看不出原材料是什么的.

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