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          What do you do when it _____? 
          --- I often stay at home and read books.
          A．rainingB．rainC．rainsD．is rains
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          考察時態(tài)。when引導時間狀語從句。從句描述的是反復性的動作，故用一般現(xiàn)在時態(tài)。主語是it，單數(shù)第三人稱，故謂語動詞要用單數(shù)形式。選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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