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Having taken our seats, _______.  
[     ]
A. the professor began the lecture  
B. the lecture began soon 
C. we were attracted by the lecture soon 
D. the bell announced the beginning of the lecture
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科目：高中英語(yǔ) 來源：同步題 題型：單選題

Only __________according to the directions can the medicine be quite effective.    
[     ]
A. taking                        
B. taken    
C. being tak'en                  
D. having been taken

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