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          Waste paper shouldn’t _____ everywhere. It’s our duty to keep our classroom clean.
           A. be thrown               B. throw                      C. is thrown
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
           本題的含義是不應(yīng)該到此亂扔廢紙，should為情態(tài)動詞后加動詞原形，本題前半句表示被動的意思，結(jié)構(gòu)為be+過去分詞，故本題選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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