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          We ________ our hands while they were singing on the stage.
          A．clapB．have clappedC．were clappingD．a(chǎn)re clapping
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          while引導(dǎo)的從句常用過去進(jìn)行時。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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