题目

Mr.Smith ___________ is smoking is looking for what he lost yesterday. A. whom      B. who        C. which 答案：B 【解析】 试题分析：句意：在吸烟的史密斯先生正在找昨天他丢的东西。当先行词是人时，引导词用who/that,结合句意，故选B 考点：考查定语从句的用法

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