问题
单项选择题
The economic model that enables consumers to sell goods or services to each other is( ).
A．C2G
B．C2B
C．B2B
D．C2C
答案
参考答案：D
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The economic model that enables consumers to sell goods or services to each other is( ).
A．C2G
B．C2B
C．B2B
D．C2C
参考答案：D
