一Why didn’t you try your best to get on the bus?
    一I tried to，but ______ I could，it started moving．
    A．untilB．whenC．before D．a(chǎn)fter
    			
    


			
    

		
    
		
		
	
    
		
    
			
    
				
    
				
    C
    考察介詞用法，四個(gè)選項(xiàng)分別表示直到……、當(dāng)……時(shí)候、在……以前和在……后。根據(jù)題意，你為什么不盡力上車(chē)？——我盡力了，但是在我登上車(chē)之前，它開(kāi)始發(fā)動(dòng)了。故選C。
    				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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