单项选择题


A．many
B．all
C．every
D．each
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单项选择题
A．payB．payingC．helpD．helping
A．pay
B．paying
C．help
D．helping
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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