--Hi, Mark. How was the musical evening?--Excellent! Alex and Andy performed ________ and they won the first prize.A.skillfullyB.monlyC.willinglyD.nervously
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A解析解析：考查副词的辨析。根据答语中excellent, won the first prize等信息可推知他们俩表演得很熟练(skillfully)。monly通常地、粗劣地；willingly甘愿地；nervously紧张地。