单项选择题
A. It is entirely our fault. B. to talk to the Manager？ C. I’m terribly sorry. D. with our compliments.
A. That’s Research and Development. B. No， thank you. C. Yes. D. Thank you.
A. that could benefit both of us. B. then he could get a large discount. C. that is made with certain conditions. D. to be more flexible over terms of payment.