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          The water in the river nearby will be dirtier than before if nothing __________.
          A．has done B．will be done 
          C．is done D．was done 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          

          解析試題分析：句意:如果什么措施也不采取的話，附近河里的水將會比以前更臟。if如果，引導(dǎo)條件狀語從句，從句中用一般現(xiàn)在時表示將來；并且從句中的主語nothing是動詞do的承受著，應(yīng)該用被動語態(tài)，故選C。
          考點(diǎn)：考查一般現(xiàn)在時被動語態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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