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           — It’s raining. When did it start?
          — As far as I know, it ____ for three hours.
          A．rains B．rained  
          C．has rained D．will rain 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          

          解析試題分析：句意：下雨了。什么時(shí)候開始的？——據(jù)我所知，已經(jīng)下了三個(gè)小時(shí)了。結(jié)合語境可知本句描述的是從過去一直持續(xù)到現(xiàn)在的動作，故用現(xiàn)在完成時(shí)態(tài)。選C。
          考點(diǎn)：考查時(shí)態(tài)辨析
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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