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          ---Could I go boating this weekend, Dad?
          ---Yes, you ________. But you ________ come back before lunch.
          A．could; mustB．can; mustC．could; shouldD．must; should
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：這個周末我能去劃船嗎？是的，你可以。但是你必須在午飯前回來。Could you do …?中的could表示委婉語氣，不是過去時態(tài)。故回答是經(jīng)常用，can. Must,必須，表示一種主觀看法。should,應(yīng)該。表示某鐘責任和義務(wù)。根據(jù)句意，故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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