—Thank you for your help Mr. Smith. I’ll hand in my paper tomorrow.—. You may send it to

问题补充：

—Thank you for your help, Mr. Smith. I’ll hand in my paper tomorrow.

—. You may send it to my mailbox 3 days later.

A. No hurry

B. With pleasure

C. Come on

D. Nothing serious

答案：

(答案→)A. No hurry

B. With pleasure

C. Come on

D. Nothing serious

解析：考查交际用语：A. No hurry不急，B. With pleasure很高兴，C. Come on加油，D. Nothing serious 没什么严重的，句意：--谢谢你的帮助，斯密斯先生，明天我就上交我的论文。--不急，你可以三天后寄到我的邮箱。选A。