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          ______ is often the case in science, there is no simple answer
          A．ThatB．AsC．WhenD．Where
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意為：正如在科學(xué)上一樣，沒有那么簡單的答案。從句中缺少主語，四個(gè)選項(xiàng)中只有as能夠做主語。when /where 在從句中狀語，that引導(dǎo)定從不放句首，不用于非限制性定語從句，故應(yīng)為B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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