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          A housing bubble is an economic situation _____ occurs when house prices rise much too fast.
          A．whichB．whereC．whatD．why
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析:考查定語從句。從結(jié)構(gòu)判斷situation為先行詞，后面跟定語從句，從句中缺少主語，所以用關(guān)系代詞which。B，D選項(xiàng)是關(guān)系副詞，在從句中不做主語，C選項(xiàng)what不引導(dǎo)定語從句。句意：房地產(chǎn)泡沫是一種經(jīng)濟(jì)形勢，這種經(jīng)濟(jì)形勢只有當(dāng)房價上升太快的時候才會發(fā)生。所以A選項(xiàng)正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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