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          He had to retire(退休) early ______ poor health.
          A．a(chǎn)s a resultB．because
          C．soD．because of
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          連詞考查。Because與because of都表示原因，但because必須引導(dǎo)句子，而because of后跟名詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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