Researchers at Gasnite Company have developed an improved method of___________fuel from industrial waste materials.

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问题 Researchers at Gasnite Company have developed an improved method of___________fuel from industrial waste materials.

选项 A、extracts
B、extraction
C、extracted
D、extracting

答案D

解析考查动名词用法。句意：Gasnite公司的研究员已经发明了一种很先进的从工业废料中提取燃料的方法。method of后应加名词，故排除A、C。B、D两项都是名词，但D项是动名词.可以和后面from连用，构成extract…from…，意为“从……提取……”。

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