表达合作意愿的常用句型 — 国际贸易选择题

在撰写建立业务关系函电的结尾段，向新客户表达合作意愿时，下列哪一句最符合外贸英文函电的惯用表达？ A. We shall be very glad to enter into business relations with you on the basis of equality and mutual benefit. B. Hey, wanna do some business together or not? C. You have no choice but to trade with our company. D. I am writing to complain about your products.