The magician picked several people ______ from the spectators and asked them to help him with the performance.

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问题 The magician picked several people ______ from the spectators and asked them to help him with the performance.

选项 A、by chance
B、at random
C、on occasion
D、on average

答案B

解析 at random“随便,随意地,胡乱地”;A项by chance“偶然地,意外地”;C项 on occasion“不时地,间或”:D项on average“平均”。
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