摘要: The magician picked several persons from the audience and asked them to help him with the performance. A. by accident B. on occasion C. at random D. on an average[答案]C. at random.[注释]at random(=without aim or purpose)随便地.胡乱地:His clothes were scattered about the room at random.By accident意外地,on occasion偶尔,on an average平均计算.

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