[单选题]The buyer should open the ______L/C 30 days _____the time of shipment.

正确答案 ：A

relative．before

[单选题]Please effect payment when the draft（）.

正确答案 ：A

expires

[单选题]We（）some brochures（）to illustrate the types of materials we manufacture.

正确答案 ：A

enclose;

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