For exporters,we usually ask our

For exporters,we usually ask our buyers to open letters of credit ______ seller' s documentarydrafts at sight.
A、available by
B、available to
C、acceptable by
D、acceptable to
【正确答案】：A
【题目解析】：[解析]句意：对出口商而言，我们通常要求买方根据卖方的即期跟单汇票开通信用证支付。available by 后常接兑换方式，意为“根据，依据”，符合题意。而be available to表示“可提供的，可得到的”；be acceptable to/by 表示“为 所接受”