The magician picked several persons______from the audience and asked them to hel

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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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