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          People _________ rivers for transportation since the beginning of history.
          A．usedB．have usedC．useD．had used
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：自從歷史之初人們就用河水來作為交通工具，根據(jù)句意和since引導(dǎo)的從句可知用完成時(shí)，現(xiàn)在完成時(shí)的構(gòu)成have done的結(jié)構(gòu)。結(jié)合語境故選B
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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