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、at random
C、on occasion
D、on average

答案 B

解析习语辨析。A．by accident偶然；B．at random随便地，任意地，胡乱地；C．on occasion有时；D．on average平均起来；因此B为答案。

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