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          The manager is talking with his secretary _____ the telephone. They usually keep in touch _____ telephone.
          A．by ;onB．through; byC．on; onD．by ;with
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查介詞的用法。by當(dāng)“通過”講時(shí)，其后不加冠詞；through當(dāng)“通過”講時(shí)，其后加冠詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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