单项选择题

What was the main concern of industrialists before the marketing concept was widely accepted（）

A．The needs of the market.
B．The efficiency of production.
C．The satisfaction of the user.
D．The preferences of the dealer.

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单项选择题
3（）

A．not one
B．not any
C．none one
D．no any
单项选择题
Sellers in the group buying benefit by （）.

A．paying less
B．selling many products at once
C．bargaining with each buyer
D．selling goods at a higher price
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