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            • 1． ___ countless failures, the scientist finally succeeded in discovering the chemical substance.
              [      ]

              A. Suffered    
              B. Being suffered    
              C. To suffer      
              D. Having suffered
              难度：中等
              解析 收藏 试题篮
            • 2． The disco, digitally         in the studio, sounded fantastic at the party that night.
              [     ]

              A. recording        
              B. having recorded      
              C. to be recorded        
              D. recorded
              难度：中等
              解析 收藏 试题篮
            • 3． ____, they were forbidden to leave the company.

              [     ]


              A. Not having finished their jobs
              B. Having not finished their jobs
              C. Not finishing their jobs
              D. Not finished their jobs
              难度：中等
              解析 收藏 试题篮
            • 4． _____ warned of the danger of losing his way in the jungle, he still wanted to have an adventure.   
              [     ]

              A. To be
              B. Being
              C. Having been
              D. Having
              难度：中等
              解析 收藏 试题篮
            • 5． ______ the program, they have to stay there for another two weeks. 
              [     ]

              A. Not completing  
              B. Not completed  
              C. Not having completed  
              D. Having completed
              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． _____ nearly 400 miles before nightfall, all of us felt exhausted(筋疲力尽). 
              [      ]

              A. Covering
              B. Covered
              C. Having covered
              D. To be covered
              难度：中等
              解析 收藏 试题篮
            • 8．
              _____ himself with necessary knowledge and skills, the young man went to the job market with much confidence.

              A. Equipped
              B. Equipping
              C. Having equipped
              D. Being equipped
              难度：中等
              解析 收藏 试题篮
            • 9． _____ on the subject for half an hour, Liu Ying suddenly stopped.
              [     ]

              A. To be worked
              B. To work
              C. Having worked
              D. Having been worked
              难度：中等
              解析 收藏 试题篮
            • 10．
              She went to the supermarket and _____ what she needed, she returned home, light-hearted.
              A. bought
              B. having bought
              C. buying
              D. to have bought
              难度：中等
              解析 收藏 试题篮
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