—Would you like to go the hospital to help the sick kids this Sunday?

—________. I'll be free then.[ ]

A. Sorry, I can't  

B. Not at all  

C. Thank you  

D. Sure, I'd love to

电子化支局营业操作系统中，交易代码101表示是的是什么邮件？（）

A.外埠挂刷

B.本埠挂刷

C.外埠平刷

D.本埠平刷