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           The scientists ________ on the new medicine for two years. They will succeed in no time. 
          A．workB．a(chǎn)re workingC．have workedD．will work
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C 

          試題分析: 句意：科學(xué)家們已經(jīng)研制這個新藥兩年了，他們馬上就要成功了。 in no time馬上；根據(jù)for 
          two years兩年，可知時態(tài)為現(xiàn)在完成時，故選C.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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