问题
选择题
. 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
答案：C
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. 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