___________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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