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          There are several chemical factories        waste water into the river.
          A．pour             B．pouring              C．pours
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          本題的完整句子應(yīng)為There are several chemical factories that/which are pouring waste water into the river,本題是同時(shí)省略主語和謂語，只留下pouring,故選Ｂ，Ｃ為第三人稱的單數(shù)明顯錯(cuò)誤，因?yàn)榍懊娴闹髡Z工廠是復(fù)數(shù)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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