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                  we were playing basketball on the playground, it began to rain.
          A．WhileB．After
          C．BeforeD．Since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：當(dāng)我們正在操場(chǎng)上打籃球時(shí)，開始下雨了。when,當(dāng)，強(qiáng)調(diào)從句的動(dòng)作發(fā)生時(shí)，主句的動(dòng)作正在發(fā)生。while,強(qiáng)調(diào)從句的動(dòng)作在發(fā)生的過程中，主句的動(dòng)作發(fā)生了。根據(jù)句意，故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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