题目内容

The magician picked several persons from the audience and asked them to help him with the performance.
A．by accidentB．on occasion C．at randomD．on an average
C
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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