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

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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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