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          ________ there are living creatures in the outer space as those on Earth hasn't been proved until now.
          A．HowB．When
          C．Where D．Whether
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          D 考察主語。句意：在外部空間是否有與地球相同的生物直到現(xiàn)在還沒有得到證明。Whether引導主語從句，意為是否。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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