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          Look! The students _____ the classroom.
          A. cleaning B. are cleaning C. are clean   
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：看！學(xué)生們正在打掃教室。根據(jù)look可知正在看，此處用現(xiàn)在進(jìn)行時(shí)be doing.故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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