选择题：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.

题目内容：

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

参考答案：

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