问题

（）, businesses offer services for which they charge a fee that is based on the number of

（）, businesses offer services for which they charge a fee that is based on the number of size of transactions they process.

A.In the fee-for-transaction revenue model B.In the web catalog revenue model C.In the traditional catalog-based retail revenue&39; model D.In the advertising-supported revenue model

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参考答案

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