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          Both his parents look sad . Maybe they __what's happened to him .
          A．knewB．have known
          C．must knowD．will know
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          

          解析試題分析：句意：他的父母看起來都傷心。也許他們知道了他發(fā)生了什么。Ａ. knew知道（過去） ，Ｂ. have known（已經(jīng)）知道了，Ｃ. must know 一定知道，Ｄ.will know將會(huì)知道。據(jù)句意have known表示known發(fā)生在過去對(duì)現(xiàn)在造成的影響是Both his parents look sad .，句子要用現(xiàn)在完成時(shí)態(tài)，故選B。
          考點(diǎn)：考查現(xiàn)在完成時(shí)態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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