◎ 题干
There is ____ Mr. Smith at the door who wants to speak to you.
A.a someB.certainC.some aD.a certain
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“There is ____ Mr. Smith at the door who wants to speak to you.A.a someB.certainC.some aD.a certain…”主要考查了你对  【人称代词】【相互代词】【疑问代词】【关系代词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。