单项选择题

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

A．by accident
B．at random
C．on occasion
D．on average
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单项选择题
Moreover, in the modern age ______ human beings depend so much on machines, Francis Chichester had given men throughout the world new pride.
A．when
B．whether
C．more
D．ever
单项选择题
The manager promised to have my complaint ______.
A．looked through
B．looked into
C．looked over
D．looked after
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