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 average

答案C

解析 介词短语用法。by accident“意外地”;on occasion“偶尔”;at random“随便地,胡乱地”;onaverage“平均计算”。根据句意,魔术师从audience中点几个人协助表演,这种情况应该是随意的。故答案为C。
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