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托福英语句子问题Volcanoes are divided into three main groups,based o

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托福英语句子问题
Volcanoes are divided into three main groups,based on their shape and the type of
material they __________ .
(A) are made
(B) made of
(C) are made of
(D) made for
答案说A和D可以先排除(为什么?)
并且可以判断不是which are made of 的省略结构,否则之前的they没有用(这是怎么判断的?)所以排除B(为什么知道不是这个结构就能排除B了?)
由.组成:be made of或be made from 故排除A,D