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            • 1． Millions of new workers ___ the Field of wind power over the past three decades．
                       A．entered                B．enter                C．have entered                                       D．had entered
              难度：中等
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            • 2． The number of the traffic accidents   _________   since the new traffic law came out．
              A．reduced greatly                   
              B．was greatly reduced
              C．has been greatly reduced     
              D．had greatly reduced
              难度：中等
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            • 3． His uncle went abroad in 2010, and _______since．
              A．has not been heard of                                
              B．had not been heard of
              C．had not heard of                                   
              D．has not heard of
              难度：中等
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            • 4． A large number of tall buildings ______in Wenzhou in the past few years.
              A．has been built 
              B．have been built     
              C．were built                   
              D．have built
              难度：中等
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            • 5． Many parents complain that children      the TV hopelessly.
                A. are becoming addicted to              B. have become addicted to
                C. have become addicted with             D. have addicted to
              难度：中等
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            • 6． The price of  wheat         15% compared to last year because of financial problems.
              A．has decreased by     
              B．have decreased by   
              C．has decreased to      
              D．have decreased to
              难度：中等
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            • 7．  — What happened to the postman?
               — I don’t know. He         around here for a long time.
              A．hasn’t seen.    
              B．didn’t see   
              C．wasn’t seen    
              D．hasn’t been seen
              难度：中等
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            • 8． —Several hotels in this area are closing down．
              —That's because tourism itself ____ since last year．
              A．is declining     
              B．declined     
              C．had declined    
              D．has been declining
              难度：中等
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            • 9． —Why does the steak smell so strange?
              —I ____ it, it seems．
              A．had burnt       
              B．was burning             
              C．have burnt      
              D．will burn
              难度：中等
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            • 10． —Has your son come back from abroad for the winter vacation?
                       —Yes．But he stayed at home for only a week．Now he       back to college．
                       A．went               B．has gone                   C．was going           D．will go
              难度：中等
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