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           In the office an electrical engineer is looking through the instructions to know ________ the heat system works before the repair work.
          A．whetherB．why
          C．howD．that
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          C 考察賓語從句。句意：辦公室里的一名電氣工程師在瀏覽說明書為了弄明白供熱系統(tǒng)是如何工作的。本句是一個賓語從句，表示方式。根據(jù)句意可知C正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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