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          --The man in a black suit _______ be our youth worker.
           -- I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.            
          A．must; can’tB．can; mustn’t C．can; couldD．must; won’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：那個(gè)穿黑色禮服的人一定是我們的青年工人。我確信他不是。我?guī)追昼娗霸趯?shí)驗(yàn)樓里看見(jiàn)他了。第一個(gè)空是一種語(yǔ)氣比較肯定的推測(cè)，而can’t表示“不可能”，根據(jù)后面的I saw him in the laboratory building some minutes ago.可以看出，他在實(shí)驗(yàn)室里有可能是科技人員；故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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