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          Tom, clean up the broken glass _________ someone walks on it.
          A．sinceB．whenC．beforeD．a(chǎn)s
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：考查連詞：A.since自從，既然，B. when當…時候，C. before在…前面，D. as 正如，因為，雖然，句意：湯姆，在有人踩在上面之前把破碎的玻璃打掃干凈。選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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