【单选题】
            
 The magician picked several persons ________from the audience and asked them to help him with the performance.
A.by accident
B.at random
C.on occasion
D.on average
        
        
			
            
            
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				根据网考网移动考试中心的统计,该试题:
2%的考友选择了A选项
84%的考友选择了B选项
11%的考友选择了C选项
3%的考友选择了D选项