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                is more important is      as the earth cooled down, water began to appear on its surface.
          A．What /thatB．That/whatC．What / whatD．That / that
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          本題考查名詞性從句。第一個(gè)空是一個(gè)缺少空語的主語從句，第二空是一個(gè)表語從句，表語從句又是一個(gè)as引導(dǎo)的時(shí)間狀語從句。因此答案是A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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