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單項選擇題

Please inform us ____ the supply and demand situation in your country.

A. to
B. of
C. with
D. in

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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

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

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