--- The party is so great!

--- Yes, but Johnson, we’ve got to go home. ______

--- Thank you. See you later.

A．Enjoy yourself!

B．See you.

C．I’m very sorry.

D．What about you?

电子商业汇票信息查询打印交易中“打印贴现凭证”的票必须是（）的票据。

A.买断式贴现已签收

B.回购式贴现已签收

C.买断式贴现待签收

D.未做贴现的票