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The magician picked some persons from the audience _____ and asked them to help him with the performance.
A.by accident B.in vainC.at randomD.on average
C

试题分析:短语辨析。A偶然;B徒劳;C胡乱;D平均;句意:那位魔术师从何观众中胡乱调出了几个人,并请求他们帮助表演。根据句意说明C正确。
点评:本题考查的介词的短语辨析,要根据上下文的语境来进行辨析。在平时的学习中要注意对这些短语的分类辨析。
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