The magician picked three persons______ from the audience and asked them to help him with the performance.

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问题 The magician picked three 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 average

答案C

解析 短语辨析 by accident“偶然”;on occasion“有时,间或”;on average“平均,通常”;at random“随便地,任意地”。
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