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單項選擇題

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

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單項選擇題

In your letter of April 10, you did not mention ____ the price of arts & crafts.

A. to raise
B. having raised
C. rise
D. having risen

單項選擇題

_____ we appreciate your counter-offer, we your prices too low to be acceptable.

A. Meanwhile
B. While
C. However
D. Whether

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