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          With the development of high technology, more and more new things _____ to the field of IT. 

          A. have introduced
          B. are being introduced 
          C. were introduced 
          D. had been introduced 
          			
          

			
			
			
		
          



							
          
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          With the development of high technology, more and more new things _______ to the field of IT．

          1. A.
            have introduced
          2. B.
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          3. C.
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          4. D.
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          With the development of high technology, more and more new things _____ to the field of IT. 
          

          [     ]
          A. have introduced
          B. are being introduced 
          C. were introduced 
          D. had been introduced 
          

			
          
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          With the development of high technology, more and more new things _______ to the field of IT．
            
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          With the development of high technology, more and more new things ________ to the field of IT．
            
                 A．have introduced                     B．a(chǎn)re being introduced
            
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          With the development of high technology, more and more new things ________ to the field of IT．
            
          A．have introduced                     B．a(chǎn)re being introduced
            
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