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           —Our classroom _____________ every day.
          —So it is. It’s our duty to keep it clean and tidy.
          A．cleanedB．cleans
          C．is cleaningD．is cleaned
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          

          解析試題分析：句意：我們的教室每天都被打掃。確實(shí)如此。保持教室的干凈整潔是我們的職責(zé)。物作主語應(yīng)該用被動，被動語態(tài)的結(jié)構(gòu)是：主語+be+動詞的過去分詞，clean的過去分詞為cleaned，故選D。
          考點(diǎn)：考查被動語態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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