单项选择题

The magician picked out several persons ______ from the audience and asked them to help him with the performance.

A．by accident
B．on average
C．on occasion
D．at random
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单项选择题
British hopes of a gold medal in the Olympic Games suffered ______ yesterday, when Hunter failed to qualify during the preliminary heats.
A．a sharp set-back
B．severe set-back
C．a severe blown-up
D．sharp blown-up
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