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            • 1． _________the difficult problem,the professor continued to do his experiment.    
              [     ]

              A. Having solved                              
              B. Solved    
              C. Solving                                   
              D. Having been sloved
              难度：中等
              解析 收藏 试题篮
            • 2． Dina,____  for months to find a job as a waitress, finally took a position at a local advertising agency.    
              [     ]

              A. struggling          
              B. struggled    
              C. having struggled    
              D. to struggle
              难度：中等
              解析 收藏 试题篮
            • 3． You can hardly imagine the once clear canal _____ so seriously polluted that no fish can live in it.
              [     ]

              A. have become  
              B. having become  
              C. to have become  
              D. to become
              难度：中等
              解析 收藏 试题篮
            • 4． _______ such heavy pollution already, it may now be too late to clean up the river.     
              [     ]

              A. Having suffered    
              B. Suffering  
              C. To suffer      
              D. Suffered
              难度：中等
              解析 收藏 试题篮
            • 5． All the tasks___________ahead of time, they decided to go on holiday for a week.
              [     ]

              A. been fulfilled    
              B. were fulfilled  
              C. having been fulfilled    
              D. had been fulfilled
              难度：中等
              解析 收藏 试题篮
            • 6． Dina,_______ for months to find a job as a waitress,finally took a position at a local advertising agency.   
              [     ]

              A. struggling                      
              B. struggled  
              C. having struggled                
              D. to struggle
              难度：中等
              解析 收藏 试题篮
            • 7． ___ his work, he started to play the computer games.  
              [     ]

              A. Being finished    
              B. Having finished    
              C. Finishing      
              D. Having been finished
              难度：中等
              解析 收藏 试题篮
            • 8． _           that she didn't do a good job, I don't think I am abler than her.        
              [     ]

              A. To have said                
              B. Having said        
              C. To say                      
              D. Saying
              难度：中等
              解析 收藏 试题篮
            • 9． ____ their work, they had a rest.
              [     ]

              A. Having finished    
              B. Finished    
              C. Having been finished    
              D. Finishing
              难度：中等
              解析 收藏 试题篮
            • 10．       from other continents for millions of years, Australia has many plants and animals not found in  any
              other country in the world.     
              [     ]

              A. Being separated                
              B. Having separated      
              C. Having been separated            
              D. To be separated
              难度：中等
              解析 收藏 试题篮
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