A、market transactions are important in different countries.
B、dealers are needed in doing business.
C、middlemen can play great role in different transactions and different countries.
D、middlemen in different countries have different actions in business.
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试题解析
解析:第三段中,对这些middleman的作用进行了阐述,从中我们可以看到他们在不同的国家都起到了重要的作用。