theold man in a brown coat over there is mr.smith

答案：C．本题考查冠词的用法．名词man后面的介词短语提示man表示特指意义，用定冠词the；"穿着一件…"，表示数量是"一"，所以用a或者an来表示，brown首字母音素为辅音音素，所以用不定冠词a表达．故选C．

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