Having taken our seats, ___ .

A. the professor began the lecture  

B. the lecture began in no time

C. we were attracted by the lecturer immediately

D. the bell announced the beginning of the lecture

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)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

查看答案和解析>>

同步練習(xí)冊(cè)答案