单项选择题

Issues of price, place, promotion, and product are ______ conventional concerns in planning marketing strategies.

A．these of the most
B．most of those
C．among the most
D．among the many of
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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
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
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