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            • 1． All possible means ______. However, nothing can _____ his wife dying of lung cancer.
              [     ]

              A. has tried; stop    
              B. have tried; keep   
              C. have been tried; prevent        
              D. has been tried; stop
              难度：中等
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            • 2． Steven ________ since he got out of work three weeks ago.
              [     ]

              A. has been unemployed
              B. was unemployed
              C. had been unemployed
              D. has unemployed
              难度：中等
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            • 3． His sister left home in 1998, and _________ since.
              [     ]

              A. had not heard of
              B. has not heard of    
              C. had not been heard of
              D. has not been heard of
              难度：中等
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            • 4． The old couple ______ for 50 years and never once have they quarreled with each other.
              [     ]

              A. have married
              B. have been married
              C. have got married
              D. had married
              难度：中等
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            • 5． — Is Lucy still hunting for a job?
              — Yes. She _________ for 7 months.
              [    ]

              A. isn't employed  
              B. wasn't employed
              C. isn't being employed      
              D. hasn't been employed
              难度：中等
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            • 6． I _______ you for sixteen years and I still don't know what goes on in your mind.

              [     ]


              A. have married
              B. have got married to
              C. have married with
              D. have been married to

              难度：中等
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            • 7． In the last few years thousands of films _____ all over the world.  
              [     ]

              A. have produced  
              B. have been produced    
              C. are producing    
              D. are being produced
              难度：中等
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            • 8． — When will the expert come and give the lecture on economic development?  
              — Not until our program ____ by the authorities.
              [     ]

              A. approves
              B. is to approve
              C. has been approved
              D. will be approved
              难度：中等
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            • 9．
              ______ around the Water Cube, we were then taken to see the Beijing National Stadium, known as the Bird's Nest.

              A. Having shown
              B. To be shown
              C. Having been shown
              D. To show
              难度：中等
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            • 10．
              Since the world heritage list was first created in 1972, many more sites _____ it.
              A. have added up to
              B. are added to
              C. have been added up to
              D. will be added up to
              难度：中等
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