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單項選擇題

We are enclosing a full set of copy documents ______this first consignment

A. referring
B. covering
C. regarding to
D. as for

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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

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