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All prices must be quoted （） Us dollars.

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We are in receipt of your letter of credit （） which we thank you.

90 percent of the credit amount must be paid （） the presentation of documents.

A. at
B. by
C. when
D. against

Please quote us competitive prices for models （） for export.

A. be able to
B. able
C. payable
D. available

在发生法律效力之后，要约人欲使其丧失法律效力而取消该项要约的意思表示，其行为属于（）

A. 要约邀请
B. 要约撤回
C. 缔约过失
D. 要约撤销