单项选择题

()in Beijing for more than twenty years, he knows the city very well.

A. Living     
B. Lived      
C. Having lived   
D. To live

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单项选择题
() more time, the scientists will be able to work out a good solution to the problem.

A. Given    
B. Giving      
C. To give     
D. Be given
单项选择题
Only when we came back home,()that my watch was missing.

A. did I find             
B. I found
C. I had found             
D. Had I found
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