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After years of research, he found the key ____ differences between species.
A.to explainB.to explainingC.of explainingD.explaining
B

试题分析:考查动名词做宾语:the key“关键”后面接to doing做定语,因为to是介词,所以接动名词,句意:多年的研究后,他发现解释物种间差异的关键。选B。
点评; 英语中有些动词短语中的to是介词只能接动名词做宾语,如get down to doing,pay attention to doing,be used to doing,prefer doing to doing等平时要加强记忆。
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