As to terms of payment,we often

As to terms of payment,we often require a confirmed letter of credit payable by draft at __________
【正确答案】：sight
【题目解析】：[解析]句意：关于支付条件，我们通常要求的是保兑的、凭即期汇票支付的信用证。draft at sight表示 “即期汇票”。