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John, _______ university professor, is considered to be _______ success as ______ expert in the agriculture research.

A.a; a; an B.an; / ; an C.the; /; an D.a; the; an 

A

解析试题分析:句意:约翰,一位大学教授,作为一名农业研究的专家,被认为是一位成功的人士。第一空泛指一位大学教授,university的第一个音素是辅音,所以用a;第二空的success是抽象名词具体化了,指成功的人或者成功的事物,这里指一个成功的人。第三空的泛指一位expert,以元音开始,所以使用an,故选A。
考点: 考查冠词的用法。

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