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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coal是共同的来源呢
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