Having taken our seats, ______.

 A. the professor began the lecture    B. the lecture began in no time

 C. we were attracted by the lecture immediately 

 D. the bell announced the beginning of the lecture  

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科目：高中英語 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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