單項(xiàng)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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1.單項(xiàng)選擇題Please inform us ____ the supply and demand situation in your country.

A. to   
B. of   
C. with   
D. in

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題_____ we appreciate your counter-offer, we your prices too low to be acceptable.

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

5.單項(xiàng)選擇題The offer is firm subject ____ before October 1.

A. for your reply reaches us    
B. for your reply reaching us    
C. to our receiving your reply  
D. to your reply reaching us