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				 Newton was playing under an apple tree        an apple fell onto his head.  A. when        B.  while      C. after       D.  before			【查看更多】
			


		
           
          


		
          
		
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          Newton was playing under an apple tree              an apple fell onto his head. 
          

          [     ]
          A. when 
          B. while 
          C. after 
          D. before 
          

			
          
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          Newton was playing under an apple tree _____an apple fell onto his head.
            
          A．when            B．while              C．a(chǎn)fter              D．before
          

			
          
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           Newton was playing under an apple tree____ an apple fell onto his head.
              
                A.  while                            B.  when                            C.  before
              
          

			
          
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          Newton was playing under an apple tree           an apple fell onto his head．
            
          A．when                   B．while                   C．a(chǎn)fter                             D．before
          

			
          
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          Newton was playing under an apple tree ________ an apple fell onto his head．
          

          

          [　　]
          

          A．when
          

          

          B．while
          

          

          C．after
          

          

          D．before
          

          

          

			
          
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