单项选择题

The magician picked three persons______ from the audience and asked them to help him with the performance.

A．by accident
B．on occasion
C．at random
D．on average
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单项选择题
At the police station Jones was asked to______ the man who had stolen her purse.
A．recognize
B．claim
C．identify
D．arrest
单项选择题
Finding a job can be______ and disappointing, and therefore it is very important that you are prepared.
A．exploiting
B．frustrating
C．profiting
D．misleading
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