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           It remains to be seen ________ this plan is practical enough to keep the project going.
          A．whetherB．how
          C．whereD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          A 考察名詞性從句。句意：這個計劃是否足夠可行讓這個工程繼續(xù)下去還有待于進一步觀察。What引導(dǎo)主語從句，it是形式主語，根據(jù)句中的remains to be seen可知此處是指一種不確定性。故A正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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