正确答案: C

upon

题目：Please note that Item no．789 can be certainly promised for immediate shipment ____ receipt of your order.

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学习资料的答案和解析：

[单选题]We regret（）to accept your terms of payment and therefore have to return the order to you.

being unable

[单选题]When yon（）an agent，it is usual to（）the appointment in writing.

appoint，make