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          They learned it all by themselves. That is to say nobody told them ________ .
          A．what to do itB．how to do itC．where to doD．when to do
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：他們是自學的這些技能。也就是說沒有人告訴他們該如何去做這些事。本句考查特殊疑問詞+to do做賓語；A項中it多余；C和D項少了it；結合句意可知，B項符合要求；故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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