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          It is believed that a new kind of drug _____ by the scientists and they are hopeful that 
          they will succeed in a couple of months. 

          A. has been developed 
          B. is being developed 
          C. is developing 
          D. has developed 
          			
          

			
			
			
		
          



							
          
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          It is believed that a new kind of
drug ______ by the scientists and they are hopeful that they will succeed in a
few months. 
          


          A. has been
developed                  B.
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          C. is
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          [     ]
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          It is believed that a new kind of drug _____ by the scientists and they are hopeful that 
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          [     ]
          A. has been developed 
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          It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a few months. 
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          It is believed that a new kind of drug _________ by the scientists and they are hopeful that they will succeed in a few months．
          

          

          [　　]
          

          A．has been developed
          

          

          B．is being developed
          

          

          C．is developing
          

          

          D．has developed
          

          

          

			
          
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