—Can you stay for dinner?   —I’d love to, but I _______ go to the airport to meet my aunt.

A．will

B．would

C．have to

D．had better

汇票上未记载付款日期的，为（）。

A.见票即付

B.票据无效

C.付款人可以决定任意时间付款

D.见票后1个月内必须付款