◎ 题干

. The magician picked several persons from the audience and asked them to help him with the performance.
A.by accidentB.on occasion
C.at randomD.on an average
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“. The magician picked several persons from the audience and asked them to help him with the performance.A.by accidentB.on occasion C.at randomD.on an average…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。