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            • 1． —Mom, today I received a message telling me to send money to the account.
              —Delete it. It's a trick. Many a person ________ by such tricks.
              [     ]

              A. have been cheated              
              B. were cheated
              C. has been cheated              
              D. was cheated
              难度：中等
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            • 2． Creat as Newton was, many of his ideas        today and are being modified by the work of scientists of
              our time.    
              [     ]

              A.   have challenged        
              B.   have been challenged    
              C．have questioned      
              D.   have been questioning
              难度：中等
              解析 收藏 试题篮
            • 3． The construction of the two new railway lines       __by now.    
              [     ]

              A．has completed    
              B．have completed    
              C．have been completed    
              D．has been completed

            难度：中等
            解析 收藏 试题篮
          • 4． When you get the paper back, pay special attention to what          .     
            [     ]

            A. have marked                
            B. have been marked      
            C. had marked                
            D. had been marked
            难度：中等
            解析 收藏 试题篮
          • 5． - Why does the lake smell terrible?
            - Because large quantities of water  ________ .             
            [     ]

            A. have polluted    
            B. is being polluted    
            C. has been polluted    
            D. have been polluted
            难度：中等
            解析 收藏 试题篮
          • 6． 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
            解析 收藏 试题篮
          • 7．
            — I ____ to a party, but I've got nothing to wear. 
            — Why don't you have a dress made for the party?

            A. was asked
            B. will ask
            C. have asked
            D. have been asked
            难度：中等
            解析 收藏 试题篮
          • 8．
            — We want to sit at the table near the door.
            — I'm sorry, but it ______ already.

            A. was taken
            B. has taken
            C. will be taken
            D. has been taken
            难度：中等
            解析 收藏 试题篮
          • 9．
            — Can I sit at the table?
            — Sorry, but it _____ already.

            A. was taken
            B. has taken
            C. has been taken
            D. will be taken
            难度：中等
            解析 收藏 试题篮
          • 10．
            － How many times ______ not to play with fire?
            － I'm sorry. I'll never do that again.
            A. do you tell
            B. had you told
            C. are you told
            D. have you been told
            难度：中等
            解析 收藏 试题篮
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