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


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          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(huì)比以前更臟。if如果，引導(dǎo)條件狀語(yǔ)從句，從句中用一般現(xiàn)在時(shí)表示將來(lái)；并且從句中的主語(yǔ)nothing和動(dòng)詞do之間構(gòu)成被動(dòng)的關(guān)系，應(yīng)該用被動(dòng)語(yǔ)態(tài)，故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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