3. (单选题) 汇票的付款期限的下述记载方式中,( )必须由付款人承兑后才能确定具体的付款日期。(本题1.5分)
A. at sight
B. at xx days after sight
C. at xx days after date
D. at xx days after shipment
出自:平顶山学院-国际结算(专升本)