The magician picked several persons ______ from the audience and asked them to h

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问题 The magician picked several persons ______ from the audience and asked them to help him with the performance.

选项 A、by accident
B、on occasion
C、at random
D、on an average

答案 C

解析短语辨析。这四个选项都是短语，by accident表示“偶然”；on occasion表示“有时；遇必要时”；at random意指“随机抽取”；on an average表示“通常；按平均”。根据句意，为了表现魔术的魅力，要随机抽取观众参加表演才显得更真实，所以C)项符合题目要求。

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