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          We can't work out the physics problem. Can you tell us         ?
          A．how to doB．what to do it
          C．how to do itD．what should to do
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          疑問詞后接動詞不定式。句意“我們不能算出這個物理難題，你能告訴我們怎樣算出來”，what可作為do的賓語，how不可作為do的賓語，因此后需加代詞it，因此選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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