问题
单项选择题
Please note that Item no．789 can be certainly promised for immediate shipment ____ receipt of your order.
A. if
B. whether
C. upon
D. at
答案
参考答案：C
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Please note that Item no．789 can be certainly promised for immediate shipment ____ receipt of your order.
A. if
B. whether
C. upon
D. at
参考答案：C