单项选择题

______is forbidden in the meeting-room, but we are allowed in the room for smokers.

A．Smoking, smoking
B．Smoking, to smoke
C．To smoke, smoking
D．To smoke, to smoke
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单项选择题
He said he had no difficulty ______the boat himself.
A．mending
B．to mend
C．in mending
D．A and C
单项选择题
The foreigners once （）their products to our company at a（）higher price.

A. sent, very   
B. lent, still     
C. sold, much    
D. showed, more
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