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【題目】The magician picked several persons ______ from the audience and asked them to help him with the performance.

A. by accident B. at random C. at risk D. on average

【答案】B

【解析】

試題分析：考查介詞短語辨析。介詞短語by accident偶然；at random胡亂；at risk冒險；on average平均；句意：魔術師從觀眾中胡亂挑選了幾個人，請他們幫助他進行表演。根據(jù)句意可知B正確。

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