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          He was so deep in thought，thinking of the problem ________ he knocked into the tree without noticing it.
          A．whenB．while
          C．becauseD．that
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          解析　考查狀語從句的引導詞。so...that...表示“如此……以致……”，引導結果狀語從句。句意為：他思考問題太投入了，以致一不留神兒撞到了樹上。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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