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    【題目】Because of the poor defence work, the flood overflowed the riverbanks, ________ frequently happened in that area last decade.
    A.as itB.whichC.itD.such
    			
    


			
    

		
    
		
		
	
    
		
    
			
    
				
    
				
    【答案】B
    【解析】
    考查定語從句。句意：由于防御工事做得不好，洪水漫過了河岸，這在那個地區(qū)近十年來經(jīng)常發(fā)生。此處是整個句子作先行詞，后面的非限制性定語從句用which引導，故選B。
    				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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