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          The cleaners must prevent the street ______.
          A．getting dirtyB．from dirtyC．from get dirtyD．from getting dirty
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：prevent sb from doing sth預(yù)防，阻止某人干某事，from是介詞后面接名詞或者動(dòng)名詞。故選D，清潔工必須防止大街變臟。
          點(diǎn)評(píng)：prevent sb from doing sth預(yù)防，阻止某人干某事，from是介詞后面接名詞或者動(dòng)名詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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