Please note that the goods you ordered can be certainly promised

Please note that the goods you ordered can be certainly promised for immediate shipment ________ receipt of your L/C.
A、upon
B、with
C、in
D、without
【正确答案】：A
【题目解析】：句意：请注意，我方承诺一旦收到你方的信用证，将立即发送你们所订货物。upon receipt of表 示“一旦收到”。