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        1. ___________for his good skill, this doctor has a lot of visitors calling for help all the time.
          A.KnowingB.To knowC.KnownD.To have known
          C

          試題分析:句意為:由于他的技術(shù)出名,當時這個醫(yī)生有很多游客前來求助。這是一個獨立結(jié)構(gòu),應(yīng)該用分詞短語作狀語,由于其與句中邏輯主語是被動關(guān)系,應(yīng)用過去分詞形式,故選C。
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