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          —Can I go to the park, Mum?
          —Certainly. But you ______ be back by six o’clock. 
          A．can B．may C．might D．must
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          考查情態(tài)動(dòng)詞的用法。同意孩子去公園，但是有要求：必須在6點(diǎn)之前回來。must“一定，必須”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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