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题库 / GmatLaCourse-SC-39
As well as fossil fuel and building material, the coal is the source of the raw material of producing steels.
As well as fossil fuel and building material, the coal is the source of the raw material
Besides fossil fuel and building material, the coal is also the source of raw material
The coal is the source not only of fossil fuel and building material, but also of raw material
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为什么用递进关系？B的besides如果改成except for，对吗？
主要倒不是因为这个递进关系，而是因为比如A里的as well as的对象是 the coal，这是不对的。
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