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          —Shall we go out for a swim?
          —Sorry, I can’t. I ______ housework for my mother now.
          A．a(chǎn)m doingB．is doingC．a(chǎn)re doingD．did
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A 
          考查動詞時態(tài)。根據(jù)語境“我不能出去游泳，（因為）我現(xiàn)在正在為我媽媽做家務(wù)。”后有now.故用現(xiàn)在進行時。選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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