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          By yesterday, the plane ______out of view for more than a month.
          A．isB．has beenC．wasD．had been
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：到昨天，飛機已經(jīng)失去聯(lián)系了一個多月。根據(jù)By yesterday可知該用過去完成時，所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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