A. As is known, we set great store by the trade relationship with the third world countries.B. We’ve never had any difficulties with our Chinese partners, and we ’ d like to make as many new contacts as we can.C. We have been working on expanding our scope of cooperation with China.D. Although we have not heard from you for quite some time, we hope your business is progressing satisfactorily.虽然好久未收到你方来信，愿业务进展顺利。