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           Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
          A．a(chǎn)fterB．beforeC．sinceD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
              
          試題分析:句意：科學(xué)家說還需要六年的時間才有可能在人身上實驗這種藥物。A在……之后；B在……之前；C自從；D當(dāng)……時候。固定句型：it will be +時間段+before從句“還要多久才”。答案選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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